Pecos, the eleventh Henry J. Kaiser-class ship, was laid down on 17 February 1988 at Avondale Shipyards in New Orleans, Louisiana, and launched on 23 September 1989. She was delivered to the Navy and placed in non-commissioned service with a primarily civilian crew under the control of the Military Sealift Command on 6 July 1990. The ship is equipped with a helicopter platform to allow for at-sea transfer of personnel and supplies.
On 9 December 1999 a United States Marine CorpsH-46helicopter crashed into Pecos and sank while participating in a training mission. Seven of the 18 personnel on board the helicopter were lost in the accident.