U.S. Central Command: U.S. Sailors and Marines aboard USS Tripoli (LHA 7) arrived in the U.S. Central Command area of responsibility, March 27. The America-class amphibious assault ship serves as the flagship for the Tripoli Amphibious Ready Group / 31st Marine Expeditionary Unit composed of about 3,500 Sailors and Marines in addition to transport and strike fighter aircraft, as well as amphibious assault and tactical assets.