RFA Lyness (A339) was a fleet stores ship of the Royal Fleet Auxiliary

Royal Fleet Auxiliary

The Royal Fleet Auxiliary is a civilian-manned fleet owned by the British Ministry of Defence. The RFA enables ships of the United Kingdom Royal Navy to maintain operations around the world. Its primary role is to supply the Royal Navy with fuel, ammunition and supplies, normally by replenishment...

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On 15 November 1980, the ship was acquired by charter by the United States Military Sealift Command and renamed USNS Sirius (T-AFS 8)

USNS Sirius (T-AFS-8)

USNS Sirius was a Sirius-class combat stores ship of the United States Navy, named for Sirius , the brightest visible star....

. She was purchased outright on 1 March 1982. On 1 July 2005, she was renamed Texas Clipper III and was transferred to the United States Maritime Administration to become the Texas Maritime Academy's new training ship.