

German World War II military units: Waffen SS, Mountain Division.

The machines of amphibious warfare have been used in places from Florida to the Persian Gulf, and battles from Iwo Jima to Normandy.

The evolution of battle gear from grenades and flak jackets to high-tech night-vision equipment.

Aided by helicopters and patrol planes, submarine hunters stalk their prey in a kill-or-be-killed game.