High Quality Content by WIKIPEDIA articles! USS General R. E. Callan (AP-139) was a General G. O. Squier-class transport ship for the U.S. Navy in World War II. She was named in honor of U.S. Army general Robert Emmet Callan. She was transferred to the U.S. Army as USAT General R. E. Callan in 1946. On 28 April 1950 she was transferred to the Military Sea Transportation Service (MSTS) as USNS General R. E. Callan (T-AP-139). Placed in reserve in 1958, she was transferred to the U.S. Air Force in 1961 and renamed USAFS General H. H. Arnold in 1963 in honor of Henry H. Arnold, the first and only General of the Air Force. She was reacquired by the Navy in 1964 as USNS General H. H. Arnold (T-AGM-9). She was struck from the Naval Vessel Register on 1 March 1982.