United States Navy Military Sealift Command

Military Sealift Command (MSC) is an organization that controls the replenishment and military transport ships of the United States Navy. Military Sealift Command has the responsibility for providing sealift and ocean transportation for all US military services as well as for other government agencies. It first came into existence on 9 July 1949 when the Military Sea Transportation Service (MSTS) became solely responsible for the Department of Defense's ocean transport needs. The MSTS was renamed the Military Sealift Command in 1970.

Military Sealift Command ships are made up of a core fleet of ships owned by the United States Navy and others under long-term-charter augmented by short-term or voyage-chartered ships. During a time charter MSC takes control of a merchant ship and operates it for the chartered amount of time. During this time the ship is crewed by civilian mariners and MSC pays for all expenses. Time chartered ships are not subject to inspections from foreign governments when in port, and MSC has operational control. Voyage chartered ships are crewed by civilian mariners, and MSC only pays the fee for transporting the cargo. These ships are chartered for the voyage, subject to inspections, and MSC does not have operational control of the ship. The Navy-owned ships carry blue and gold stack colors, are in service with the prefix USNS (United States Naval Ship), rather than in commission (with a USS prefix), have hull numbers as an equivalent commissioned ship would have with the prefix ''T-'' and are primarily civilian crewed by either civil service mariners or contract crews (see United States Merchant Marine) as is the case of the special mission ships. Some ships may have Navy or Marine Corps personnel on board to carry out communication and special mission functions, or for force protection. Ships on charter or equivalent, retain commercial colors and bear the standard merchant prefix MV, SS, or GTS, without hull numbers.

Eight programs compose Military Sealift Command: Fleet Oiler (PM1), Special Mission (PM2), Strategic Sealift (PM3), Tow, Salvage, Tender, and Hospital Ship (PM4), Sealift (PM5), Combat Logistics Force (PM6), Expeditionary Mobile Base, Amphibious Command Ship, and Cable Layer (PM7) and Expeditionary Fast Transport (PM8).

MSC reports to the Department of Defense's Transportation Command for defense transportation matters, to the Navy Fleet Forces Command for Navy-unique matters, and to the Assistant Secretary of the Navy (Research, Development and Acquisition) for procurement policy and oversight matters.

Command structure

Military Sealift Command is organized around eight programs:
* Fleet Oiler Program N031 (formerly Combat Logistics Force (PM1) or Naval Fleet Auxiliary Force NFAF)
* Special Mission Program N032 (formerly (PM2))
* Strategic Sealift Program N033 (Formerly Prepositioning (PM3))
* Tow, Salvage, Tender, and Hospital Ship Program N034 (Formerly Service Support (PM4))
* Sealift Program N035 (Formerly Sealift (PM5))
* Combat Logistics Force Program N036 (Formerly Fleet Ordnance and Dry Cargo (PM6))
* Expeditionary Mobile Base, Amphibious Command Ship, and Cable Layer Program N037 (Formerly Afloat Staging Command Support (PM7))
* Expeditionary Fast Transport Program N038 (Formerly Joint High Speed Vessel (PM8))

On 9 January 2012, the MSC command organization was reorganized via a realignment of its structure to increase its efficiency while maintaining effectiveness. To better manage this new program structure, MSC repositioned three of its key Senior Executive Service (SES) personnel, with one SES acting as the program executive over MSC's government-operated ships, a second SES serving as the program executive over contract-operated ships, and a third SES overseeing total force manpower management for MSC worldwide operations. Also, MSC realigned two of its four mission-driven programs (Combat Logistics Force and Special Mission) and adding a fifth program (Service Support). The Prepositioning and Sealift programs are unchanged by the 2012 reorganization.

As of June 2013, Military Sealift Command operated around 110 ships, and employed 9,800 people (88% of whom are civilians).

In 2015, the Military Sealift Command underwent further restructuring with the relocation from the former headquarters at Washington Navy Yard to Naval Station Norfolk.

Fleet Oiler Program N031

The Combat Logistics Force was the part of the MSC most associated with directly supporting the Navy. In 1972, a study concluded that it would be cheaper for civilians to man USN support vessels such as tankers and stores ships. The CLF is the American equivalent of the British Royal Fleet Auxiliary. These MSC ships are painted haze gray and can be easily identified by the blue and gold horizontal bands around the top of their central smokestack.

The Combat Logistics Force was formerly called the Naval Fleet Auxiliary Force. After a 2012 reorganization, this program now maintains the 32 government-operated fleet underway replenishment ships from the former Naval Fleet Auxiliary Force (NFAF). Fleet replenishment oilers form the Oilers Program N031, while the dry cargo/ammunition ships and fast combat support ships were separated to Explosive Program N036.

;Fleet Oiler Program ship types;
* Fleet Replenishment Oilers (T-AO)
* Fleet Replenishment Oilers (T-AO)

Special Mission Program N032

Military Sealift Command's Special Mission Program controls 24 ships that provide operating platforms and services for unique US Military and federal government missions. Oceanographic and hydrographic surveys, underwater surveillance, missile flight data collection and tracking, acoustic research and submarine support are among the specialized services this program supports. Special mission ships work for several different US Navy customers, including the Naval Sea Systems Command and the Oceanographer of the Navy. These ships like those of the NFAF are painted haze gray with blue and gold stack bands.

After a 2012 reorganization, this program now maintains all of its 24 contract-operated ships involved in missile range instrumentation, ocean surveillance, submarine and special warfare support, oceanographic survey, and navigation test support. Some of its ships were transferred to the new Service Support program.

;Special Mission ship types;
* Missile Range Instrumentation Ship (T-AGM)
* Navigation Test Support Ship (T-AGS)
* Ocean Surveillance Ships (T-AGOS)
* Oceanographic Survey Ships (T-AGS)
* Submarine and Special Warfare Support (T-AGSE)
* Sea-based X-band Radar (SBX)

Strategic Sealift Program N033

Military Sealift Command's Prepositioning Program is an element in the US's triad of power projection into the 21st century—sea shield, sea strike and sea basing. As a key element of sea basing, afloat prepositioning provides the military equipment and supplies for a contingency forward deployed in key ocean areas before need. Part the prepositioning strategy is forward presence and power projection. Prepositioning extends the reach of operations, isolates conflicts away from the United States, allows for a swift response to conflict, and reduces time and resources delegated to transporting cargo. The MSC Prepositioning Program supports the US Army, Navy, Air Force and Marine Corps and the Defense Logistics Agency. Prepositioning ships remain at sea, ready to deploy on short-notice the vital equipment, fuel and supplies to initially support military forces in the event of a contingency. The Prepositioning Program consists of 34 at-sea ships plus two aviation support ships kept in reduced operating status. These ships wear civilian livery, and are only designated "USNS" if government-owned; those chartered from civilian owners are either "SS" or "MV". Two Dry Cargo/Ammunition Ships (T-AKE) are included in the program in a Reduced Operational Status (ROS).

;Strategic Sealift Program ship types;
* Air Force Container Ships (T-AK)
* Army Container Ships (T-AK)
* Dry Cargo/Ammunition Ships (T-AKE)
* Aviation Logistics Support Ship (T-AVB)
* Break-Bulk Ships (T-AK)
* Large, Medium-Speed, Roll-On/Roll-Off Ships (T-AKR)
* Marine Corps Container and Roll-On/Roll-Off Ships (T-AK/T-AKR)
* Expeditionary Transfer Dock (T-ESD)

Tow, Salvage, Tender, and Hospital Ship Program N034

Formerly Service Support (PM4) it consists of fleet ocean tugs, rescue and salvage ships, submarines tenders, and hospitals ships formerly from the NFAF. Command ships and cable layers were transferred to the N037 program.

;Service Support ship types;
* Fleet Ocean Tugs (T-ATF)
* Rescue/Salvage Ships (T-ARS)
* Submarine Tender (AS)
* Hospital Ships (T-AH)

Sealift Program N035

The mission of the Sealift Program is to provide ocean transportation to the Department of Defense by meeting its sealift requirements in peace, contingency, and war with quality, efficient cost effective assets and centralized management. This is achieved through the use of commercial charter vessels, Large, Medium-Speed Roll-on/Roll-off ships, and the Maritime Administration's Ready Reserve Force, including the eight former MSC fast sealift ships. Sealift is divided into three separate project offices: Tanker Project Office, Dry Cargo Project Office and the Surge Project Office.

;Sealift Program Ship Types;
* Dry Cargo Ships (T-AK)
* Large, Medium-Speed, Roll-On/Roll-Off Ships (T-AKR)
* Tankers (T-AOT)

Combat Logistics Force Program N036

Formerly the Fleet Ordnance and Dry Cargo (PM6), it is composed of twelve Dry Cargo/Ammunition ships and two Fast Combat Support ships. Dry Cargo and Ammunition ships, or T-AKEs, were designed to replenish dry and refrigerated stores as well as ordnance. They have replaced combat stores ships and ammunition ships incorporating the capabilities of both platforms into one hull. These multi-product ships increase the delivery capability to provide food, fuel, spare parts, ammunition and potable water to the U.S. Navy and allies' ships. Fast Combat Support Ships or T-AOEs provide parts, supplies and fuel at sea.

;Combat Logistics Force Ship Types;
* Dry Cargo/Ammunition Ships (T-AKE)
* Fast Combat Supply (T-AOE)

Expeditionary Mobile Base, Amphibious Command Ship, and Cable Layer Program N037

Formerly the Afloat Staging Command Support (PM7) program, it is composed of the Expeditionary Mobile Base ships (replacement for the Afloat Forward Staging Base), the Amphibious Command Ship , and the cable layer .

;Afloat Staging Command Support Program Ship Types;
* Expeditionary Mobile Base (ESB) – ( ESD subvariant)
* Amphibious command ship (LCC)
* Cable layer (T-ARC)

Expeditionary Fast Transport Program N038

This consists of the class of ships formerly known as the Joint High Speed Vessel (JHSV) program but was changed to (EPF) in September 2015. The Expeditionary Fast Transport (EPF) program is a cooperative effort for a high-speed, shallow draft vessel intended for rapid intratheater transport of medium-sized cargo payloads. The EPF will reach speeds of 35–45 knots (65–83 km/h; 40–52 mph) and will allow for the rapid transit and deployment of conventional or special forces as well as equipment and supplies.

;Expeditionary Fast Transport Program Ship Types;
* Expeditionary Fast Transport
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Area commands

MSC headquarters is located at Naval Station Norfolk in Norfolk, VA. As a result of a 2012 organization, MSC's 12 worldwide MSC ship support units (SSUs) will now report to the MSC operational area commands in their respective areas of responsibility. These are responsible for crewing, training, equipping and maintaining MSC's government-owned, government-operated ships.
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