 After almost a month in port at San Francisco, "ATA—192" got underway for Pearl Harbor, bound for the atomic bomb tests at Bikini Atoll in the Marshall Islands.She spent four months in the Marshall Islands during Operation Crossroads, the designation for the tests, ferrying personnel, helping fight fires caused by the tests, and, on one occasion, towing the former Imperial Japanese Navy battleship "Nagato", in use as a target ship for the tests.During her stay in the Marshall Islands, "ATA-192" also was a frequent visitor to Kwajalein Atoll and Eniwetok Atoll.