_ Director of Exercise Desert Rock VII and VIII is Lt. General Robert N. Young, Commanding General of the Sixth U. S. Arny, Presidio of San Francisco. Deputy Director is Brigadier General Walter A, Jensen, Commanding General of Camp Irwin, California.. \ U. S. Navy The Navy is conducting a training project sponsored by the U. S. Navy Bureau of Yards and Docks. Navy personnel perform monitoring exercises in an induced field of comparatively low radiation. The Navy is also conducting effects tests on non-rigid airships (blimps) and helicopters in many shots during the series. Marine Corps Approximately 2,500 Marines participated in a combined airground exercise in connection with the Hood shot detonated July 5. This maneuver was a further test of the Corps! established doctrine of "vertical envelopment" in tactical atomic warfare. The Fourth Marine Corps Provisional Atomic Exercise Brigade, commanded by Brigadier General Harvey C. Tschirgi, conducted the_ exercise, Making up the Brigade are elements of the First Marine Division, Camp Pendleton, and the Third Marine Aircraft Wing, Marine Corps Air Station, El Toro. The Fourth Brigade executed a tactical maneuver involving the helicopter lifting a reinforced infantry battalion in air attack to seize, occupy and defend an objective in exploitation of an atomic explosion. A company of the battalion mobed to the ground objective mounted in LVTP5's - the Marine Corps! latest version of the amphi- bian tractor that stormed Pacific beaches in World War II. The armored monster is capable of bringing Marines ashore with dry feet, and then transporting them inland to their objective. Supporting the amphibian-mounted company was a platoon of the Corps' newest anti-tank weapon - the Ontos - a small tracked vehicle with tremendous firepower, Marine close air support was furnished by jet fighter air- craft bas€da at the Marine Corps Air Facility, Mojave, California. U. S. Air Force Participation of the Air Force in Operation Plumbbob includes an important air support role, participation in experimental operations, and training. oe hey - 63 -