Airman Zachary Althaus, from Green Bay, Wis., uses an iron to seal a plastic covering on an oxygen cart while Airman Sean Matos, from Bronx, N.Y., holds the plastic in place in the hangar bay aboard the aircraft carrier USS Ronald Reagan. Oxygen carts are used to transport oxygen tanks to and from aircraft during flight operations. Sealing oxygen carts in plastic when not in use helps prevent rust and corrosion of the equipment. Ronald Reagan is currently moored in its home port of San Diego.