USNS William McLean (T-AKE 12) is a of the United States Navy, named in honor of William McLean, a United States Navy physicist, who conceived and developed the heat-seeking Sidewinder missile. The contract to build William McLean was awarded to National Steel and Shipbuilding Company on 12 December 2008. William McLean was launched on 16 April 2011, sponsored by Dr. McLean's niece, Margaret Taylor. The ship was delivered to the Military Sealift Command (MSC) on 28 September 2011.
USNS William McLean has a shield "Per fess nebuly enhanced, two piles reversed in chief point issuant from dexter and sinister base, Azure and Argent, all counterchanged, in base a compass rose Gules bearing a globe Celeste with grid lines of the second; a bordure of steel Proper." Her crest is "From a wreath Argent and Azure two steel anchors erect Proper, superimposed by a seahorse rampant of the second gorged with a collar Gules charged with the Roman numerals "XII" Argent, all below an arced rope Proper tied to each anchor ring." Her motto is "A scroll, with ends behind base of the missiles, Azure doubled Gules and inscribed with "SI VIS PACEM, PARA BELLUM" (IF YOU WANT PEACE, PREPARE FOR THE WAR) Argent." and her supporters are "On either side of the shield a Sidewinder heat-seeking Missile erect Proper." The ship's seal is "the coat of arms as blazoned in full color upon a white oval enclosed by a blue collar edged on the outside with a gold rope bearing the inscription "USNS WILLIAM McLEAN" at top and in base "T-AKE 12" in gold letters."
On 22 December 2016 the USNS William McLean returned to Naval Weapons Station Yorktown from a 47-day surge deployment to the United States Sixth Fleet in the Mediterranean Sea.
McLean helped the Navy's Multipurpose Amphibious Assault and Transport ships, and , as part of Operation Odyssey Lightning.
On Tuesday February 3rd 2026 USNS William McLean departed Naval Station Norfolk on a 5 month deployment to the US Navy's 6th Fleet. It is currently ported in Greece having met up with USS Gerald R. Ford for logistical support. McLean is now on its own with USS Gerald R Ford out of action due to a fire. McLean will remain in Greece until further notice.