Service of young men in the Marine Corps. Combat training of infantrymen on the parade ground: military drummers are marching, drumming. Soldiers in sports: they are engaged in gymnastic apparatus, simulators, study hand-to-hand combat. During military exercises, infantrymen pass an obstacle course, clean the barrel of a gun, transfer shells to the tank, jump into the water, swim with the equipment, lie in the trenches, run, shoot. Signalers work on the seashore. Infantrymen climb the cliff on a rope. Transport plane takes off, cockpit view, crew. Ejection of equipment from an aircraft, parachute landing. Military equipment: tanks, mortar, helicopter, anti-aircraft gun, cannon, armored personnel carrier, grenade launcher. Seascape, seagulls, rocks.