USNS Andrew J. Higgins

Andrew J. Higgins entered non-commissioned U.S. Navy service under Military Sealift Command control with a primarily civilian crew on 22 October 1987. She was taken out of active service on 6 May 1996 and placed in reserve in the National Defense Reserve Fleet in Suisun Bay at Benicia, California, where she remained until September 2009. She was the first ship of her class to be taken out of service.

In 2008, Andrew J. Higgins was selected for transfer to Chile as a Foreign Assistance Act grant. She was stricken from the Naval Vessel Register on 6 January 2009 and sold to Chile on 19 May 2009. She was withdrawn from the Reserve Fleet at Suisun Bay on 24 September 2009 and towed to the Atlantic Marine Alabama shipyard at Mobile, Alabama, to undergo a three-month refit and overhaul.

Renamed Almirante Montt with the identification number AO-52, the oiler was commissioned in the Chilean Navy on 10 February 2010, replacing the oiler Araucano.

In an effort to address the Royal Canadian Navy's at-sea support services capability gap until the arrival of its new Protecteur-class supply ships, Canada signed a Mutual Logistic Support Arrangement with Chile in 2015. As part of that arrangement, the Chilean Navy operated Almirante Montt for 40 sea days in the Canadian Pacific region in support of Royal Canadian Navy training requirements in July and August 2015, working with the frigates HMCS Calgary and HMCS Vancouver.[1][2] Almirante Montt returned to Canada in 2016, operating with the Royal Canadian Navy from April to June 2016.[2]