The Tank Corps, National Army, was the stateside tank unit of the United States Army during and after World War I. Preceded by the Tank Service of the National Army of 15 February 1918 in the 65th Engineers at Camp Meade, the service was removed from the Engineer Corps and organized as the Tank Corps, National Army, with command transferring from Col H. H. Ferguson to Col Ira Clinton Welborn on 9 March.