USNS General H. H. Arnold (T-AGM-9) (originally named 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.