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The aircraft carrier USS Theodore Roosevelt pulls alongside the Military Sealift Command fleet replenishment oiler USNS Big Horn  during an underway replenishment Oct. 24, 2013 . Theodore Roosevelt is underway conducting carrier qualifications.

The aircraft carrier USS Theodore Roosevelt pulls alongside the Military Sealift Command fleet replenishment oiler USNS Big Horn during an underway replenishment Oct. 24, 2013 . Theodore Roosevelt is underway conducting carrier qualifications. (Sean Hurt/U.S. Navy)

The aircraft carrier USS Theodore Roosevelt pulls alongside the Military Sealift Command fleet replenishment oiler USNS Big Horn  during an underway replenishment Oct. 24, 2013 . Theodore Roosevelt is underway conducting carrier qualifications.

The aircraft carrier USS Theodore Roosevelt pulls alongside the Military Sealift Command fleet replenishment oiler USNS Big Horn during an underway replenishment Oct. 24, 2013 . Theodore Roosevelt is underway conducting carrier qualifications. (Sean Hurt/U.S. Navy)

Petty Officer 2nd Class Nickolas Graham fires a messenger line from the guided-missile cruiser USS San Jacinto during a replenishment-at-sea with the Military Sealift Command oiler USNS Pecos on Dec. 28, 2013 in the Persian Gulf. The San Jacinto is deployed as part of the Harry S. Truman Carrier Strike Group supporting maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet area of responsibility.

Petty Officer 2nd Class Nickolas Graham fires a messenger line from the guided-missile cruiser USS San Jacinto during a replenishment-at-sea with the Military Sealift Command oiler USNS Pecos on Dec. 28, 2013 in the Persian Gulf. The San Jacinto is deployed as part of the Harry S. Truman Carrier Strike Group supporting maritime security operations and theater security cooperation efforts in the U.S. 5th Fleet area of responsibility. (Preston Paglinawan/U.S. Navy)

When U.S. Navy ships at sea need supplies such as food and fuel, those supplies usually come to them via another ship from the Military Sealift Command.

In a Navy evolution commonly referred to as an UNREP, which is short for underway replenishment, both ships maneuver alongside each other continuously moving forward often for hours at time with fuel lines connected and cargo being transferred from one ship to the other.

It’s an evolution that requires precise navigation.

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