Amphibious vessels: specialized landing craft built to go where no other combat ship can reach and able to deliver tanks, jeeps, soldiers, and supplies to the front lines. We detail some of the greatest ships in the history of amphibious warfare, from the LCT, which dropped the huge Allied fighting force onto the beaches of Normandy in 1944, to the Swift boats that patrolled Vietnam's shores. We also chart the evolution of combat hovercraft, and how the PACVs of the '60s grew to become a mainstay for the U.S. Navy's Assault Craft Units.