The Lightweight Rucksack was the primary rucksack utilized by United States troops during the Vietnam War. Its ensemble consisted of a nylon pack with a cinch cord, top flap and three exterior pockets and a tubular aluminum frame with padded shoulder straps and waist belt. The Lightweight Rucksack was developed in 1962 as a part of the United States Army's efforts to develop suitable equipment for use by what were then advisors in South Vietnam and later the deployed ground forces, through testing by the 5th Special Forces Group (Airborne) at the Panama Canal Zone. Four different patterns of the LW Rucksack exist, with the latter two models featuring attachment points which allow the pack itself to be mounted in two and three different locations on the frame, respectively. A prototype ruck