The Lightweight Rucksack was the primary rucksack utilized by United States troops during the Vietnam War and also used in arctic and alpine areas. It replaced the M1952 rucksack (FSN 8465-261-6831) and was in turn replaced by the ALICE in 1973. The 1967 Training Circular TC 10-8. Lightweight Rucksack: Nylon OG106 served as a "how to use" manual.
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, Nylon, OG106 (FSN 8465-782-3248) was developed in 1962 as a part of the United States Army's efforts to develop suitable equipment for use by Special Forces, long-range reconnaissance patrols, and mountain and arctic troops. Testing was conducted by the 5th Special Forces Group (Airborne) in Alaska and Panama Canal Zone. Four different patterns of the lightweight 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 rucksack was produced in 1962, featuring a welded frame. The 1964 model was virtually the same, but with the contract information stamped in the pack rather than sewn in on a label. The next improvement came along in 1965, when the frame was changed to a riveted version rather than a welded one. The last modification was made in 1968, with the addition of a middle horizontal back strap. In South Vietnam the lightweight rucksack replaced and augmented the M1956 and M1961 versions of combat packs and was later partially replaced by the tropical rucksack of the M1967 MLCE (Designed specifically for jungle warfare). The rucksack was typically mounted low on the frame allowing bulky equipment to be strapped above. Stocks of lightweight rucksacks were replaced in United States military service beginning in 1974 with the adoption of the ALICE equipment. Lightweight rucksacks are currently quite desirable among collectors and period reenactors alike, and often retail for anywhere between $250 and $350 USD at dedicated militaria dealers and online auctions.
- Metzger, Eldon (July 1975). History Of The Development Of The LINCLOE Load-Carrying Equipment. Natick, MA: U.S. Army Materiel Command. Retrieved 2014-09-12.
- Training Circular TC 10-8, United States Army: The Lightweight Rucksack: Nylon OG106 (With Riveted Frame), September 1967
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