The I Bomber Command (later XX Bomber Command) was an intermediate command of the Army Air Forces during World War II. It trained bombardment units and aircrews for deployment to combat theaters. From shortly after the attack on Pearl Harbor until its assets were transferred to Army Air Forces Antisubmarine Command in October 1942, it conducted antisubmarine warfare off the Atlantic and Gulf coasts of the United States. The command was activated again for a brief period in 1943, again as a bomber training command, located in the southwestern United States. It was disbanded in October 1943.