 After service in the United States Navy from 1995 through 2003 as USS "Rainier" (AOE-7), she was decommissioned and her weapons systems were removed, then she was transferred on August 29, 2003 to the Military Sealift Command, which designated her USNS "Rainier" (T-AOE-7).During Operation Unified Assistance, the international relief effort following the 2004 Indian Ocean earthquake and tsunami, "Rainier" provided underway replenishment support to 32 American, British, and Australian warships involved in this operation.Like other fast combat support ships, she is part of MSC's Naval Fleet Auxiliary Force.