LSM-60s keel was laid on 7 July 1944 and she was launched on 29 July.[2] She was commissioned on 25 August.[3]
LSM-60 participated in the assault landings at Iwo Jima, where she earned one battle star.[3]
See also: Operation Crossroads. In 1946, the United States conducted the first nuclear weapon tests designed to measure nuclear explosion effects on ships, Operation Crossroads. The second shot of this test, BAKER, was designed to test the effects of an underwater nuclear blast on surface ships and submarines.
LSM-60 was modified with a well through the cargo deck and hull, a derrick to lower the bomb through the well, and a large antenna to receive the detonation signal. On 25 July, a standard Mk. 3A "Fat Man" type atomic bomb, nicknamed Helen of Bikini, placed in a watertight casing, was suspended 90 feet below LSM-60 in the lagoon of Bikini Atoll in the Marshall Islands.[4] At 0835 local time the bomb was detonated, destroying LSM-60 and eight target ships, including .[5] A seaman present claimed that "there was not one identifiable piece of the LSM-60 ever located",[4] however a British naval constructor present reports he saw a 3inches square piece of LSM-60 on the deck of a target ship afterward.[6]