The Military Sealift Command (MSC) hospital ship, USNS Mercy (T-AH 19) pulls into Pearl Harbor for a scheduled port visit. Mercy is making its first stop during a humanitarian assistance mission to the Western Pacific and Southeast Asia. U.S. Navy photo by Photographer's Mate 2nd Class Justin P. U.S Naval hospital ship USNS Mercy (T-AH 19) arrived here May 2, making its first stop during a humanitarian assistance mission to the Western Pacific and Southeast Asia. This deployment to the region exemplifies the U.S. commitment to South and Southeast Asia and the Pacific island nations while building upon relationships established during Operation Unified Assistance in 2005. Meeting the arriving ship at the pier, Adm. Gary Roughead, commander, U.S.