Aberdeen Proving Ground (APG) (sometimes erroneously called Aberdeen Proving ''Grounds'') is a U.S. Army
The United States Army (USA) is the land service branch of the United States Armed Forces. It is one of the eight U.S. uniformed services, and is designated as the Army of the United States in the U.S. Constitution.Article II, section 2, cl ...
facility located adjacent to Aberdeen
Aberdeen (; sco, Aiberdeen ; gd, Obar Dheathain ; la, Aberdonia) is a city in North East Scotland, and is the third most populous city in the country. Aberdeen is one of Scotland's 32 local government council areas (as Aberdeen City), and ...
, Harford County
Harford County is located in the U.S. state of Maryland. As of the 2020 census, the population was 260,924. Its county seat is Bel Air. Harford County is included in the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area, which is al ...
, Maryland
Maryland ( ) is a state in the Mid-Atlantic region of the United States. It shares borders with Virginia, West Virginia, and the District of Columbia to its south and west; Pennsylvania to its north; and Delaware and the Atlantic Ocean to ...
, United States. More than 7,500 civilians and 5,000 military personnel work at APG.
There are 11 major commands among the tenant units, including:
*
United States Army Communications-Electronics Command (CECOM)
*
United States Army Combat Capabilities Development Command
The Combat Capabilities Development Command, (DEVCOM, aka CCDC) (formerly the United States Army Research, Development, and Engineering Command (RDECOM)) is a subordinate command of the U.S. Army Futures Command. RDECOM was tasked with "creating, ...
(CCDC)
*
United States Army Test and Evaluation Command
U.S. Army Test and Evaluation Command, or ATEC, is a direct reporting unit of the United States Army responsible for developmental testing, independent operational testing, independent evaluations, assessments, and experiments of Army equipment. (ATEC)
* Edgewood Arsenal
* Adelphi Laboratory Center
**The Army Reserve Information Operations Command
**Unified Cross Domain Services Management Office
**HQ, U.S. Army Contracting Command (Army Contracting Command –APG, Adelphi Contracting Division)
**U.S Army 93rd Signal Network - Network Enterprise Center
**Logistics Readiness Center
**U.S. Army Cyber Operation Group – 335th Signal Command
**Blossom Point Research Facility
History
APG is the U.S. Army's oldest active
proving ground
A proving ground (US) is an installation or reservation in which technology such as weapons, military tactics and automobile prototypes are experimented with or tested. Proving grounds can be operated by government bodies or civilian industries. ...
, established on 20 October 1917, six months after the U.S. entered
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
. The planning and construction were overseen by Brigadier General
Colden Ruggles
Colden L'Hommedieu Ruggles (March 18, 1869 – April 2, 1933) was a career officer in the United States Army. A prominent member of the Ordnance Corps, he attained the rank of brigadier general, and was notable for planning and overseeing constr ...
, who later served as the Army's
Chief of Ordnance
The United States Army Ordnance Corps, formerly the United States Army Ordnance Department, is a Combat service support (United States), sustainment branch of the United States Army, headquartered at Fort Lee (Virginia), Fort Lee, Virginia. The ...
. Its location allowed design and testing of
ordnance
Ordnance may refer to:
Military and defense
*Materiel in military logistics, including weapons, ammunition, vehicles, and maintenance tools and equipment.
**The military branch responsible for supplying and developing these items, e.g., the Unit ...
materiel
Materiel (; ) refers to supplies, equipment, and weapons in military supply-chain management, and typically supplies and equipment in a commercial supply chain context.
In a military context, the term ''materiel'' refers either to the specifi ...
to take place near contemporary industrial and shipping centers. The proving ground was created as a successor to the
Sandy Hook Proving Ground
The Sandy Hook Proving Ground was a military facility along the Atlantic coast of New Jersey established by the Secretary of War on August 7, 1874, to serve as the United States Army's first proving ground for the testing of ordnance and materi ...
, which was too small for some of the larger weapons being tested. At the peak of
World War II
World War II or the Second World War, often abbreviated as WWII or WW2, was a world war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all of the great powers—forming two opposin ...
, APG had
billet
A billet is a living-quarters to which a soldier is assigned to sleep. Historically, a billet was a private dwelling that was required to accept the soldier.
Soldiers are generally billeted in barracks or garrisons when not on combat duty, alth ...
ing space for 2,348 officers and 24,189 enlisted personnel.
Prompt critical excursion
Aberdeen was home to the Army Pulse Radiation Facility Reactor, in 1968. On 6 September 1968, this reactor was the site of a
prompt critical excursion during commissioning tests. This accident harmed no personnel but did release enough heat to reach the melting point of the fuel in the core, 1150°C. This caused damage to the fuel components of the reactor, fusing the four central rings together. This is one of thirty-three prompt critical accidents worldwide, between 1949 and 2000.
Base Realignment and Closure program
Under the
Base Realignment and Closure
Base Realignment and Closure (BRAC) is a process by a United States federal government commission to increase United States Department of Defense efficiency by coordinating the realignment and closure of military installations following the end o ...
(BRAC) program, as announced in 2005, the APG is projected to lose the Ordnance School and associated R&D facilities with 3862 military and 290 civilian jobs moving to
Fort Lee,
Virginia
Virginia, officially the Commonwealth of Virginia, is a state in the Mid-Atlantic and Southeastern regions of the United States, between the Atlantic Coast and the Appalachian Mountains. The geography and climate of the Commonwealth ar ...
. APG will gain 451 military and 5,661 civilian jobs from
Fort Monmouth
Fort Monmouth is a former installation of the Department of the Army in Monmouth County, New Jersey. The post is surrounded by the communities of Eatontown, Tinton Falls and Oceanport, New Jersey, and is located about from the Atlantic Ocean. T ...
,
New Jersey
New Jersey is a state in the Mid-Atlantic and Northeastern regions of the United States. It is bordered on the north and east by the state of New York; on the east, southeast, and south by the Atlantic Ocean; on the west by the Delaware ...
. There is a net loss of 3,411 military jobs under BRAC and a net gain of 5,371 civilian jobs.
Edgewood Arsenal
Although civilian contractors produced the major portion of conventional munitions for
World War I
World War I (28 July 1914 11 November 1918), often abbreviated as WWI, was one of the deadliest global conflicts in history. Belligerents included much of Europe, the Russian Empire, the United States, and the Ottoman Empire, with fightin ...
, the United States government built federally owned plants on Aberdeen Proving Ground for the manufacture of toxic gas. These
poison gas
Many gases have toxic properties, which are often assessed using the LC50 (median lethal dose) measure. In the United States, many of these gases have been assigned an NFPA 704 health rating of 4 (may be fatal) or 3 (may cause serious or perman ...
manufacturing facilities came to be known as Edgewood Arsenal. Edgewood Arsenal included plants to manufacture
mustard gas,
chloropicrin
Chloropicrin, also known as PS and nitrochloroform, is a chemical compound currently used as a broad-spectrum antimicrobial, fungicide, herbicide, insecticide, and nematicide. It was used as a poison gas in World War I. Its chemical structural f ...
and
phosgene, and separate facilities to fill
artillery shells
A shell, in a military context, is a projectile whose payload contains an explosive, incendiary, or other chemical filling. Originally it was called a bombshell, but "shell" has come to be unambiguous in a military context. Modern usage so ...
with these chemicals. Production began in 1918, reached per month, and totaled of toxic gas manufactured at Edgewood Arsenal before the November 1918 armistice. Some of this gas was shipped overseas for use in French and British artillery shells.
The Edgewood area of Aberdeen Proving Ground is approximately or . The Edgewood area was used for the development and testing of chemical agent munitions. From 1917 to the present, the Edgewood area conducted chemical research programs, manufactured chemical agents, and tested, stored, and disposed of toxic materials.
From 1955 to 1975, the U.S. Army Chemical Corps conducted classified medical studies at Edgewood Arsenal, Maryland. The purpose was to evaluate the impact of low-dose chemical warfare agents on military personnel and to test protective clothing and pharmaceuticals. About 7,000 soldiers took part in these experiments that involved exposures to more than 250 different chemicals, according to the Department of Defense (DoD). Some of the volunteers exhibited symptoms at the time of exposure to these agents but long-term follow-up was not planned as part of the DoD studies.
The agents tested included chemical warfare agents and other related agents:
* Anticholinesterase nerve agents (
Agent VX,
sarin, and common
organophosphorus
Organophosphorus compounds are organic compounds containing phosphorus. They are used primarily in pest control as an alternative to chlorinated hydrocarbons that persist in the environment. Some organophosphorus compounds are highly effective in ...
(OP) and
carbamate pesticides)
*
Mustard agent
Mustard gas or sulfur mustard is a chemical compound belonging to a family of cytotoxic and blister agents known as mustard agents. The name ''mustard gas'' is technically incorrect: the substance, when dispersed, is often not actually a gas, ...
* Nerve agent antidotes
atropine
Atropine is a tropane alkaloid and anticholinergic medication used to treat certain types of nerve agent and pesticide poisonings as well as some types of slow heart rate, and to decrease saliva production during surgery. It is typically given i ...
and
scopolamine
* Nerve agent reactivators (e.g., the common OP antidote
2-PAM chloride
Pralidoxime (2-pyridine aldoxime methyl chloride) or 2-PAM, usually as the chloride or iodide salts, belongs to a family of compounds called oximes that bind to organophosphate-inactivated acetylcholinesterase. It is used to treat organophosph ...
)
* Psychoactive agents (
LSD
Lysergic acid diethylamide (LSD), also known colloquially as acid, is a potent psychedelic drug. Effects typically include intensified thoughts, emotions, and sensory perception. At sufficiently high dosages LSD manifests primarily mental, vi ...
,
PCP,
cannabinoids
Cannabinoids () are several structural classes of compounds found in the cannabis plant primarily and most animal organisms (although insects lack such receptors) or as synthetic compounds. The most notable cannabinoid is the phytocannabinoid tet ...
, and
Agent BZ)
* Irritants and riot control agents
* Alcohol and caffeine
During the week of July 14, 1969, personnel from
Naval Applied Science Laboratory in conjunction with personnel from
Limited War Laboratory conducted a defoliation test along the shoreline of Poole's Island, Aberdeen Proving Ground using
Agent Orange and Agent Orange Plus foam.
The
Gunpowder Meetinghouse and
Presbury Meetinghouse located within the grounds of Edgewood Arsenal are listed on the
National Register of Historic Places
The National Register of Historic Places (NRHP) is the United States federal government's official list of districts, sites, buildings, structures and objects deemed worthy of preservation for their historical significance or "great artistic v ...
.
Other component locations within Aberdeen Proving Ground
Other parts of APG not attached to the main installation include the
Churchville Test Area in
Harford County
Harford County is located in the U.S. state of Maryland. As of the 2020 census, the population was 260,924. Its county seat is Bel Air. Harford County is included in the Baltimore-Columbia-Towson, MD Metropolitan Statistical Area, which is al ...
, and the
Carroll Island and
Graces Quarters in
Baltimore County
Baltimore County ( , locally: or ) is the third-most populous county in the U.S. state of Maryland and is part of the Baltimore metropolitan area. Baltimore County (which partially surrounds, though does not include, the independent City of ...
, Maryland. The Churchville Test Area is a
test track
Test Track is a high-speed slot car thrill ride located in World Discovery at Epcot, a theme park at the Walt Disney World Resort in Bay Lake, Florida. The ride is a simulated excursion through the rigorous testing procedures that General Mo ...
with hills that provide steep natural
grades
Grade most commonly refers to:
* Grade (education), a measurement of a student's performance
* Grade, the number of the year a student has reached in a given educational stage
* Grade (slope), the steepness of a slope
Grade or grading may also r ...
and tight turns to stress
engines
An engine or motor is a machine designed to convert one or more forms of energy into mechanical energy.
Available energy sources include potential energy (e.g. energy of the Earth's gravitational field as exploited in hydroelectric power g ...
,
drivetrains, and
suspensions
In chemistry, a suspension is a heterogeneous mixture of a fluid that contains solid particles sufficiently large for sedimentation. The particles may be visible to the naked eye, usually must be larger than one micrometer, and will eventually ...
for army vehicles, including
M1 Abrams tanks,
Bradley Fighting Vehicle
The Bradley Fighting Vehicle (BFV) is a tracked armoured fighting vehicle platform of the United States developed by FMC Corporation and manufactured by BAE Systems Land & Armaments, formerly United Defense. It is named after U.S. General Om ...
s, and
Humvee
The High Mobility Multipurpose Wheeled Vehicle (HMMWV; colloquial: Humvee) is a family of light, four-wheel drive, military trucks and utility vehicles produced by AM General. It has largely supplanted the roles previously performed by the ori ...
s.
The eastern half of Carroll Island was used as a testing location for open air static testing of chemical weapons since the 1950s. During tests of chemical agents and other compounds at Carroll Island, Maryland, from July 1, 1964, to December 31, 1971, nearly of chemicals were disseminated on the test area including of irritants, of anticholinesterase compounds such as the nerve gasses Sarin and VX, and of incapacitants such as LSD. Simulant agents, incendiaries, decontaminating compounds, signaling and screening smokes, mustard, and herbicides were also released as well as riot control gasses. The test sites consisted of spray grids, a wind tunnel, test grids, and small buildings.
Edgewood Chemical Activity
The Edgewood Chemical Activity (abbreviated ECA) was a U.S. Army site located in Edgewood, Maryland that stored chemical weapons. Its construction was started by Ordnance Corps in November 1917 and completed in less than a year. The arsenal was to ...
is a
chemical-weapons
depot
Depot ( or ) may refer to:
Places
* Depot, Poland, a village
* Depot Island, Kemp Land, Antarctica
* Depot Island, Victoria Land, Antarctica
* Depot Island Formation, Greenland
Brands and enterprises
* Maxwell Street Depot, a restaurant in ...
located at APG. Elimination of the chemicals held here was put on an accelerated schedule after the
September 11, 2001, attacks
The September 11 attacks, commonly known as 9/11, were four coordinated suicide terrorist attacks carried out by al-Qaeda against the United States on Tuesday, September 11, 2001. That morning, nineteen terrorists hijacked four commerc ...
, and all chemical weapons were destroyed by February 2006.
Fort Hoyle was established on October 7, 1922, and was created from a portion of the Edgewood Arsenal. Named for Brigadier General
Eli D. Hoyle, who had commanded the
6th Field Artillery Regiment
The 6th Field Artillery Regiment is a Field Artillery Branch regiment of the United States Army first activated in 1907 from numbered companies of artillery. It was first organized with two battalions.
6th Field Artillery assigned 8 June 1917 t ...
, the post was home to Headquarters, 1st Field Artillery Brigade (1922 to 1939), the 6th Field Artillery Regiment (1922 to 1940), the 1st Ammunition Train (1922 to 1930), and the 99th Field Artillery Regiment (minus 2nd Battalion) (1940 to 1941). Fort Hoyle was officially disestablished as a separate military post when it was reabsorbed by Edgewood Arsenal on September 10, 1940.
The
U.S. Army Ordnance Corps Museum previously located at APG, was moved to
Fort Lee, Virginia
Fort Lee, in Prince George County, Virginia, United States, is a United States Army post and headquarters of the United States Army Combined Arms Support Command (CASCOM)/ Sustainment Center of Excellence (SCoE), the U.S. Army Quartermaster Sc ...
, as a result of the 2005 Base Realignment and Closure (BRAC) Act.
Geography
APG is located at
and occupies a land area of .
Its northernmost point is near the mouth of the
Susquehanna River
The Susquehanna River (; Lenape: Siskëwahane) is a major river located in the Mid-Atlantic region of the United States, overlapping between the lower Northeast and the Upland South. At long, it is the longest river on the East Coast of the ...
, where the river enters the
Chesapeake Bay
The Chesapeake Bay ( ) is the largest estuary in the United States. The Bay is located in the Mid-Atlantic (United States), Mid-Atlantic region and is primarily separated from the Atlantic Ocean by the Delmarva Peninsula (including the parts: the ...
, while on the south, it is bordered by the
Gunpowder River
The Gunpowder River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed April 1, 2011 tidal inlet on the western side of Chesapeake Bay in Maryland, United States. It is formed by the jo ...
. The installation lies on two
peninsula
A peninsula (; ) is a landform that extends from a mainland and is surrounded by water on most, but not all of its borders. A peninsula is also sometimes defined as a piece of land bordered by water on three of its sides. Peninsulas exist on all ...
s separated by the
Bush River. The northeastern is known as the ''Aberdeen Area'' and the southwestern is called the ''Edgewood Area'' (formerly the ''Edgewood Arsenal'').
According to the
U.S. Census Bureau
The United States Census Bureau (USCB), officially the Bureau of the Census, is a principal agency of the U.S. Federal Statistical System, responsible for producing data about the American people and economy. The Census Bureau is part of the ...
, the CDP has a total area of , of which is land and (5.09%) is water.
Demographics
For statistical purposes the base is delineated as a
census-designated place
A census-designated place (CDP) is a concentration of population defined by the United States Census Bureau for statistical purposes only.
CDPs have been used in each decennial census since 1980 as the counterparts of incorporated places, such ...
(
Aberdeen Proving Ground CDP) by the U.S. Census Bureau. As of the
2020 census, the resident population was 1,668.
Contamination
The Edgewood area of the Aberdeen Proving Ground site was proposed to the Environmental Protection Agency's National Priorities List of the most serious uncontrolled or abandoned hazardous waste sites requiring long term remedial action on April 10, 1985. The site was formally added to the
National Priorities List on February 21, 1990.
The Edgewood area has large areas of land and water and numerous buildings that are contaminated or suspected of contamination. Virtually all the land areas of the site contain contaminated or potentially contaminated sites and potentially buried ordnance. Substances disposed of in the area include significant quantities of napalm, white phosphorus, and chemical agents. On-site surface waters include rivers, streams, and wetlands.
Edgewood area standby water supply wells in the Canal Creek area previously served approximately 3,000 people. The wells have been abandoned. The Long Bar Harbor well field of the County Department of Public Works and the well field used by the Joppatowne Sanitary Subdistrict serve 35,000 people within of the site. On-site groundwater sampling has identified
perchlorate
A perchlorate is a chemical compound containing the perchlorate ion, . The majority of perchlorates are commercially produced salts. They are mainly used as oxidizers for pyrotechnic devices and to control static electricity in food packaging. Per ...
, various metals,
volatile organic compound
Volatile organic compounds (VOCs) are organic compounds that have a high vapour pressure at room temperature. High vapor pressure correlates with a low boiling point, which relates to the number of the sample's molecules in the surrounding air, a ...
s (VOCs) and chemical warfare agent degradation products. On-site soil contamination sampling has identified various VOCs, metals, and unexploded ordnance in surface and subsurface soil. On-site surface water sampling has identified various metals, pesticides, phosphorus, and VOCs. People who accidentally ingest or come in direct contact with contaminated groundwater, surface water, soil, or sediments may be at risk. The area is a designated habitat for bald eagles.
Controversies
A
scandal at the APG surfaced in 1996. The U.S. Army brought charges against twelve
commissioned and
non-commissioned male officers for
sexual assault
Sexual assault is an act in which one intentionally sexually touches another person without that person's consent, or coerces or physically forces a person to engage in a sexual act against their will. It is a form of sexual violence, which ...
of female trainees under their command.
Following campaigning by
PETA
Peta or PETA may refer to:
Acronym
* Pembela Tanah Air, a militia established by the occupying Japanese in Indonesia in 1943
* People for the Ethical Treatment of Animals, an American animal rights organization
* People Eating Tasty Animals, an ...
, the
Physicians Committee for Responsible Medicine
The Physicians Committee for Responsible Medicine (PCRM) is a non-profit research and advocacy organization based in Washington, D.C., which promotes a plant-based diet, preventive medicine, and alternatives to animal research, and encourages ...
and other organizations, the U.S. military announced in 2011 that it was replacing its use of monkeys in the Army's nerve-agent attack training courses with human simulators and other non-animal teaching methods. The training drills had been carried out on
vervet monkeys
The vervet monkey (''Chlorocebus pygerythrus''), or simply vervet, is an Old World monkey of the family Cercopithecidae native to Africa. The term "vervet" is also used to refer to all the members of the genus ''Chlorocebus''. The five distinct ...
and conducted at Aberdeen Proving Ground.
See also
*
ENIAC
ENIAC (; Electronic Numerical Integrator and Computer) was the first programmable, electronic, general-purpose digital computer, completed in 1945. There were other computers that had these features, but the ENIAC had all of them in one packa ...
*
ORDVAC
The ORDVAC (''Ordnance Discrete Variable Automatic Computer)'', is an early computer built by the University of Illinois for the Ballistic Research Laboratory at Aberdeen Proving Ground. A successor to the ENIAC (along with EDVAC built earlier). ...
*
BRLESC
The BRLESC I (Ballistic Research Laboratories Electronic Scientific Computer) was one of the last of the first-generation electronic computers. It was built by the United States Army's Ballistic Research Laboratory (BRL) at Aberdeen Proving Gro ...
*
Aberdeen scandal
The Aberdeen Scandal was a military sexual assault scandal in 1996 at Aberdeen Proving Ground, a United States Army base in Maryland.
Ultimately, twelve drill instructors were charged with sex crimes; four were sentenced to prison, while eight ...
(1996)
*
United States Army Research Laboratory
The U.S. Army Combat Capabilities Development Command Army Research Laboratory (DEVCOM ARL) is the U.S. Army's foundational research laboratory. ARL is headquartered at the Adelphi Laboratory Center (ALC) in Adelphi, Maryland. Its largest singl ...
*
Ballistic Research Laboratory
The Ballistic Research Laboratory (BRL) was a leading U.S. Army research establishment situated at Aberdeen Proving Ground, Maryland that specialized in ballistics ( interior, exterior, and terminal) as well as vulnerability and lethality analysis. ...
*
Naval Air Weapons Station China Lake
*
Dugway Proving Ground
Dugway Proving Ground (DPG) is a U.S. Army facility established in 1942 to test biological and chemical weapons, located about southwest of Salt Lake City, Utah, United States, and south of the Utah Test and Training Range.
Location
Dugway P ...
*
United States Army Ordnance Training and Heritage Center
The United States Army Ordnance Training Support Facility (formerly known as the U.S. Army Ordnance Training and Heritage Center and U.S. Army Ordnance Museum) artifacts are used to train and educate logistic soldiers. It re-located to Fort Lee, ...
*
Herman Goldstine
*
Edgewood Arsenal human experiments
From 1948 to 1975, the U.S. Army Chemical Corps conducted classified human subject research at the Edgewood Arsenal facility in Maryland. The purpose was to evaluate the impact of low-dose chemical warfare agents on military personnel and to tes ...
*
Poplar Island (Chesapeake Bay)
*
Maryland World War II Army Airfields
During World War II, the United States Army Air Forces (USAAF) established numerous airfields in Maryland for training pilots and aircrews of USAAF fighters and bombers.
Most of these airfields were under the command of First Air Force or the Ar ...
*
Nevada Test and Training Range
The Nevada Test and Training Range (NTTR) is one of two military training areas at the Nellis Air Force Base Complex in Nevada and used by the United States Air Force Warfare Center at Nellis Air Force Base. The NTTR land area includes a "sim ...
*
Semipalatinsk Test Site
The Semipalatinsk Test Site (Russian language, Russian: Семипалатинск-21; Semipalatinsk-21), also known as "The Polygon", was the primary testing venue for the Soviet Union's nuclear weapons. It is located on the steppe in northeast ...
References
Further reading
*Oliveros, James P. and Don A. Vroblesky. (1989). ''Hydrogeology of the Canal Creek area, Aberdeen Proving Ground, Maryland''
ater-Resources Investigations Report 89-4021 Towson, Md.: U.S. Department of the Interior, U.S. Geological Survey.
*
*United States. Congress. Senate. Committee on Armed Services. (1997). ''Army sexual harassment incidents at Aberdeen Proving Ground and sexual harassment policies within the Department of Defense: hearing before the Committee on Armed Services, United States Senate, One Hundred Fifth Congress, first session, February 4, 1997.'' Washington, D.C. Government Printing Office.
* information about
Decommissioning aberdeen'
worldwidescience.org
External links
*
*
Global Security
Global Security
*
*
Defense Commissary Agency
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United States Army posts
Military installations in Maryland
Proving grounds
Military Superfund sites
Superfund sites in Maryland
Aberdeen, Maryland
Buildings and structures in Harford County, Maryland
Historic American Engineering Record in Maryland
1917 establishments in Maryland
Maryland populated places on the Chesapeake Bay
Military installations established in 1917