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Marks Air Force Base
Marks Air Force Base is a former United States Air Force facility located two nautical miles (4 km) west of the central business district of Nome, a city in the Nome Census Area of the U.S. state of Alaska. It was named in honor of Major Jack S. Marks, a United States Army Air Forces pilot based at Ladd Army Airfield who died when his aircraft was shot down over the Aleutians in July 1942. Following its closure, it was redeveloped into Nome Airport. History In World War II, the civilian Nome Airport shared use of the runway with Marks Army Airfield for transfer of Lend-Lease aircraft to the Soviet Union and in 1942, for air defense of the western coast of Alaska. Marks AAF units included the 404th Bombardment Squadron (July 18–28, 1942) of the 28th Bombardment Group and the 56th Fighter Squadron (June 20 – October 20, 1942) of the 54th Fighter Group. On August 15, 1947, the Arctic Indoctrination Survival School (colloquially known as "Cool School") was formed ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
United States Air Force
The United States Air Force (USAF) is the Aerial warfare, air military branch, service branch of the United States Armed Forces, and is one of the eight uniformed services of the United States. Originally created on 1 August 1907, as a part of the United States Army Signal Corps (United States Army), Signal Corps, the USAF was established as a separate branch of the United States Armed Forces in 1947 with the enactment of the National Security Act of 1947. It is the second youngest branch of the United States Armed Forces and the fourth in order of precedence. The United States Air Force articulates its core missions as air supremacy, intelligence, surveillance, target acquisition, and reconnaissance, global integrated intelligence, surveillance and reconnaissance, airlift, rapid global mobility, Strategic bombing, global strike, and command and control. The United States Air Force is a military service branch organized within the United States Department of the Air Force, De ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The National Map
''The National Map'' is a collaborative effort of the United States Geological Survey (USGS) and other federal, state, and local agencies to improve and deliver topographic information for the United States. The purpose of the effort is to provide "...a seamless, continuously maintained set of public domain geographic base information that will serve as a foundation for integrating, sharing, and using other data easily and consistently". ''The National Map'' is part of the USGS National Geospatial Program. The geographic information available includes orthoimagery (aerial photographs), elevation, geographic names, hydrography, boundaries, transportation, structures and land cover. ''The National Map'' is accessible via the Web, as products and services, and as downloadable data. Its uses range from recreation to scientific analysis to emergency response. ''The National Map'' is a significant contribution to the U.S. National Spatial Data Infrastructure (NSDI) from the Fe ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
USGS
The United States Geological Survey (USGS), formerly simply known as the Geological Survey, is a scientific agency of the United States government. The scientists of the USGS study the landscape of the United States, its natural resources, and the natural hazards that threaten it. The organization's work spans the disciplines of biology, geography, geology, and hydrology. The USGS is a fact-finding research organization with no regulatory responsibility. The agency was founded on March 3, 1879. The USGS is a bureau of the United States Department of the Interior; it is that department's sole scientific agency. The USGS employs approximately 8,670 people and is headquartered in Reston, Virginia. The USGS also has major offices near Lakewood, Colorado, at the Denver Federal Center, and Menlo Park, California. The current motto of the USGS, in use since August 1997, is "science for a changing world". The agency's previous slogan, adopted on the occasion of its hundredth an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Northwest Staging Route
The Northwest Staging Route was a series of airstrips, airport and radio ranging stations built in Alberta, British Columbia, the Yukon and Alaska during World War II. It extended into the Soviet Union as the ALSIB (ALaska-SIBerian air road). Origins The route was developed in 1942 for several reasons. Initially, the 7th Ferrying Group, Ferrying Command, United States Army Air Corps (later Air Transport Command) at Gore Field (Great Falls Municipal Airport) was ordered to organize and develop an air route to send assistance to the Soviet Union through Northern Canada, across Alaska and the Bering Sea to Siberia, and eventually over to the Eastern Front. The US-Canadian Permanent Joint Board on Defense decided in the autumn of 1940 that a string of airports should be constructed at Canadian expense between the city of Edmonton in central Alberta and the Alaska-Yukon border. Late in 1941 the Canadian government reported that rough landing fields had been completed.Carter 1983, pp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Air Transport Command (United States Air Force)
Air Transport Command (ATC) was a United States Air Force unit that was created during World War II as the strategic airlift component of the United States Army Air Forces. It had two main missions, the first being the delivery of supplies and equipment between the United States and the overseas combat theaters; the second was the ferrying of aircraft from the manufacturing plants in the United States to where they were needed for training or for operational use in combat. ATC also operated a worldwide air transportation system for military personnel. Inactivated on 1 June 1948, Air Transport Command was the precursor to what became the Military Air Transport Service in 1948 and was redesignated Military Airlift Command (MAC) in 1966. It was consolidated with MAC in 1982, providing a continuous history of long range airlift through 1992 when the mission was transferred to today's Air Mobility Command. History By no means least among the achievements of the Army Air Force ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Alaska World War II Army Airfields
During World War II, Alaska was a major United States Army Air Forces (USAAF) location for personnel, aircraft, and airfields to support Lend-Lease aid for the Soviet Union. In addition, it was in Alaska that the Empire of Japan bombed and seized United States soil and as a result the USAAF was actively engaged in combat operations against them. Airfields Combat airfields * Adak Army Airfield, : Adak Island, Aleutian Islands, 1942-1945 : Transferred to Alaskan Air Command; Became Davis Air Force Base (1947); Transferred to Department of the Navy, 1950 as Naval Air Station Adak * Amchitka Army Airfield, : Amchitka Island, Aleutian Islands, 1943-1945 : Transferred to Alaskan Air Command; Became Amchitka Air Force Base; Closed 1948, now abandoned * Alexai Point Army Airfield, : Attu Island, Aleutian Islands, 1943-1945, Closed 1945, now abandoned. * Casco Cove Army Airfield, : Attu Island, Aleutian Islands, 1943-1945 : Transferred to Alaskan Air Command, Inactivate ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Asphalt
Asphalt, also known as bitumen (, ), is a sticky, black, highly viscous liquid or semi-solid form of petroleum. It may be found in natural deposits or may be a refined product, and is classed as a pitch. Before the 20th century, the term asphaltum was also used. Full text at Internet Archive (archive.org) The word is derived from the Ancient Greek ἄσφαλτος ''ásphaltos''. The largest natural deposit of asphalt in the world, estimated to contain 10 million tons, is the Pitch Lake located in La Brea in southwest Trinidad ( Antilles island located on the northeastern coast of Venezuela), within the Siparia Regional Corporation. The primary use (70%) of asphalt is in road construction, where it is used as the glue or binder mixed with aggregate particles to create asphalt concrete. Its other main uses are for bituminous waterproofing products, including production of roofing felt and for sealing flat roofs. In material sciences and engineering, the terms "asphal ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Runway
According to the International Civil Aviation Organization (ICAO), a runway is a "defined rectangular area on a land aerodrome prepared for the landing and takeoff of aircraft". Runways may be a man-made surface (often asphalt, concrete, or a mixture of both) or a natural surface ( grass, dirt, gravel, ice, sand or salt). Runways, as well as taxiways and ramps, are sometimes referred to as "tarmac", though very few runways are built using tarmac. Takeoff and landing areas defined on the surface of water for seaplanes are generally referred to as waterways. Runway lengths are now commonly given in meters worldwide, except in North America where feet are commonly used. History In 1916, in a World War I war effort context, the first concrete-paved runway was built in Clermont-Ferrand in France, allowing local company Michelin to manufacture Bréguet Aviation military aircraft. In January 1919, aviation pioneer Orville Wright underlined the need for "distinctly m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mean Sea Level
There are several kinds of mean in mathematics, especially in statistics. Each mean serves to summarize a given group of data, often to better understand the overall value (magnitude and sign) of a given data set. For a data set, the '' arithmetic mean'', also known as "arithmetic average", is a measure of central tendency of a finite set of numbers: specifically, the sum of the values divided by the number of values. The arithmetic mean of a set of numbers ''x''1, ''x''2, ..., x''n'' is typically denoted using an overhead bar, \bar. If the data set were based on a series of observations obtained by sampling from a statistical population, the arithmetic mean is the ''sample mean'' (\bar) to distinguish it from the mean, or expected value, of the underlying distribution, the ''population mean'' (denoted \mu or \mu_x).Underhill, L.G.; Bradfield d. (1998) ''Introstat'', Juta and Company Ltd.p. 181/ref> Outside probability and statistics, a wide range of other notions of mean ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elevation
The elevation of a geographic location is its height above or below a fixed reference point, most commonly a reference geoid, a mathematical model of the Earth's sea level as an equipotential gravitational surface (see Geodetic datum § Vertical datum). The term ''elevation'' is mainly used when referring to points on the Earth's surface, while '' altitude'' or '' geopotential height'' is used for points above the surface, such as an aircraft in flight or a spacecraft in orbit, and '' depth'' is used for points below the surface. Elevation is not to be confused with the distance from the center of the Earth. Due to the equatorial bulge, the summits of Mount Everest and Chimborazo have, respectively, the largest elevation and the largest geocentric distance. Aviation In aviation the term elevation or aerodrome elevation is defined by the ICAO as the highest point of the landing area. It is often measured in feet and can be found in approach charts of the aerodrome. It i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galena Airport
Galena, also called lead glance, is the natural mineral form of lead(II) sulfide (PbS). It is the most important ore of lead and an important source of silver. Galena is one of the most abundant and widely distributed sulfide minerals. It crystallizes in the cubic crystal system often showing octahedral forms. It is often associated with the minerals sphalerite, calcite and fluorite. Occurrence Galena is the main ore of lead, used since ancient times, since lead can be smelted from galena in an ordinary wood fire. Galena typically is found in hydrothermal veins in association with sphalerite, marcasite, chalcopyrite, cerussite, anglesite, dolomite, calcite, quartz, barite, and fluorite. It is also found in association with sphalerite in low-temperature lead-zinc deposits within limestone beds. Minor amounts are found in contact metamorphic zones, in pegmatites, and disseminated in sedimentary rock. In some deposits the galena contains up to 0.5% silver, a byproduct tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
