Nice set of two rare U.S.A official army report related to SPECIFICALLY to the use of SILENCERS on weapons, enemy and allied. The Official Army Report R-1896 - Silencers - Principles And Evaluations provides detailed information, diagrams, drawings and illustrations of silencers and how they operate and a psy ops wardare guide when you would be traken prisoner, advice for interrigation etc. The first report was highly beneficial for the vietnam war given the use of silencers by tunnel rats and other special units. This report is from 1968 but the models range from WW2 weapons to up to 1968. Beautiful plates, drawings, and information on effectivity, sound etc. Great rare item and highly illustrative for your usa collection, especially if you own a demilitarized weapon with silencer, you dont find this manual easily! History of silencers in the vietnam war The Vietnam War was the first war that saw the widespread use of suppressed weapons. Special Forces, MACV-SOG, Force Recon, the SEALs, and more pioneered modern special operations in Vietnam and often did so with suppressed firearms of one kind or another. They tossed cans on M16s, AKs, Walther PPKs, M3 SMGs, and many more. Alongside all those standard firearms, we began seeing a number of oddball-suppressed weapons.