Henry J. Kaiser-class (T-AO-187)

The Henry J. Kaiser class is a class of eighteen fleet replenishment oilers built for the United States Navy, of which sixteen were completed. The original contract for T-AO 187 was awarded to Avondale Industries of New Orleans, Louisiana, in November 1982, with construction beginning in August 1984. A second-source contract for T-AO 191 and T-AO 192 went to the Pennsylvania Shipbuilding Company in May 1985; after that yard developed cash-flow problems, the associated options for T-AO 194 and 196 were transferred to Avondale and exercised in June 1988. Avondale ultimately built sixteen of the ships. The class takes its name from the lead ship, USNS Henry J. Kaiser (T-AO-187), named after the industrialist and shipbuilder Henry J. Kaiser (1882-1967). The first nine ships were named for American shipbuilders, inventors, naval architects and aeronautical engineers; the tenth through eighteenth were named for American rivers, the older U.S. Navy convention for oilers.

The oilers carry fuel oil and jet fuel for surface combatants and for aircraft embarked on aircraft carriers, with five refueling stations and replenishment positions on both sides of each hull. Two dry cargo transfer rigs and 7,400 square feet of dry cargo space allow limited transfer of stores, including eight 20-foot refrigerated containers with room for 128 pallets. A helicopter landing platform is fitted. Propulsion is by two Colt-Pielstick PC4-2/2 10V-570 medium-speed diesels driving two shafts with controllable-pitch propellers. Sensor fit consists of two AN/SPS-59 LN-66 surface search radars, with AN/SLQ-25 Nixie torpedo countermeasures. Armament is limited to .50 calibre machine guns, though space, weight and power were reserved for two Mark 15 Phalanx close-in weapon systems. Twelve of the ships are single-hulled; Patuxent (T-AO-201), Laramie (T-AO-203) and Rappahannock (T-AO-204) were completed with double hulls to meet the Oil Pollution Act of 1990, with 6 ft separation at the sides and 6 ft 6 in on the bottom, reducing cargo capacity by 12 per cent.

The ships operate under Military Sealift Command in non-commissioned status with predominantly civilian crews, and carry the USNS prefix. The sixteen completed oilers entered service between 1986 and 1996. Andrew J. Higgins (T-AO-190) was laid up in May 1996, the first of the class withdrawn; several others have since spent periods in reserve or limited operating status. Higgins never returned to U.S. service and was sold to Chile in May 2009, refitted at Atlantic Marine Alabama in Mobile, and commissioned into the Chilean Navy on 10 February 2010 as Almirante Montt.

The two Penn Ship hulls, Benjamin Isherwood (T-AO-191) and Henry Eckford (T-AO-192), were transferred to Tampa Shipyards, Inc. of Tampa, Florida. Cost disputes ended that contract in 1993 with the ships 95 and 84 per cent complete. A study of converting them to ammunition ships found the work cost-prohibitive; both were laid up in the James River Reserve Fleet and sold for recycling in 2011. Walter S. Diehl (T-AO-193) was decommissioned on 1 October 2022, and Big Horn (T-AO-198) ran aground off Oman in September 2024.

Under the U.S. Navy's fiscal year 2026 ship inactivation schedule, three more Kaiser-class oilers left Military Sealift Command service: Big Horn was inactivated on 31 March 2026 and transferred to the Maritime Administration, and John Ericsson and Pecos were both inactivated on 31 July 2026 after 35 years of service, with Ericsson retained as a logistics support hull to be cannibalised for spare parts and Pecos transferred to the Maritime Administration. The class is being replaced by the John Lewis-class replenishment oilers as they enter service.