Close air support
A nuclear weapon was detonated simultaneously as the infantry battalion maneuvered within away from ground zero, acting as an amphibious battalion landing force in the vicinity of a nuclear fallout. Close air support was used, targeting the helicopter Landing Zones ninety seconds before the Marines were set down. While the Marines were advancing, the mushroom cloud was still forming above. The battalion simulated their attacks through a buildup of mock trenches and facilities made to resemble a city.