CH-46 Helicopter Picking up Supplies

A CH-46 Sea Knight of Marine Medium Helicopter Squadron HMM-262 prepares to relay supplies from Khe Sanh to one of the base’s outlying posts on Feb. 22, 1968. Those supplies were the lifeblood of the base in northern South Vietnam that had been under siege since Jan. 21. (Bettman/Corbis)

Bettman/Corbis