While some of the lower numbered Corps were used for various exercises the inter-war years corps serve mostly as a pool of units. During that war, the Marine Corps organized corps headquarters for the first time, the I Marine (later III Amphibious Corps) and V Amphibious Corps. The Army would ultimately designate 25 field corps (I–XVI, XVIII–XXIV, XXXVI, and I Armored Corps) during World War II. After the Korean War, the Army and Marines would diverge in their approach to the concept of the field corps. The Army, continued to group its divisions into traditional corps organizations in the Continental United States (CONUS), West Germany (V Corps & VII Corps), and South Korea (I Corps). However, during the Vietnam War, the Army designated its corps-level headquarters in South Vietnam as I Field Force and II Field Force to avoid confusion with the ARVN corps areas. As of July 2016, the Army has deactivated all corps headquarters save three CONUS based corps (I Corps - Washington, III Corps - Texas, and XVIII Airborne Corps - North Carolina). In the 1960s, the Marine Corps activated the I Marine Expeditionary Force (I MEF) on Okinawa (based in California since 1971) and II Marine Expeditionary Force (II MEF) in North Carolina, and re-activated the III Amphibious Corps (which had been deactivated in 1946) as III Marine Expeditionary Force (III MEF) in South Vietnam (re-deployed to Okinawa in 1971). In 1965, all three MEFs were subsequently re-designated as Marine "Amphibious" Forces or MAFs, and in 1988 all three Marine Corps corps-level commands were again re-designated as Marine Expeditionary Forces (MEF). The MEF had evolved into a self-contained, corps-level, Marine Air Ground Task Force (MAGTF) consisting of a MEF Headquarters Group, a Marine Division, a Marine Aircraft Wing, and a Force Service Support Group (re-designated as Marine Logistics Group in 2005). The pre-World War II Red Army of the former USSR had rifle corps much like in the Western sense with approximately three divisions to a corps. However, after the war started, the recently purged Soviet senior command (Stavka) structure was apparently unable to handle the formations, and the armies and corps were integrated. Rifle Corps were re-established during the war after Red Army commanders had gained experience handling larger formations.