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In page Bulletproof vest:

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During the Korean War several new vests were produced for the United States military, including the M-1951, which made use of fibre-reinforced plastic or aluminium segments woven into a nylon vest. These vests represented "a vast improvement on weight, but the armor failed to stop bullets and fragments very successfully,"[citation needed] although officially they were claimed to be able to stop 7.62×25mm Tokarev pistol rounds at the muzzle. Such vests equipped with Doron Plate have, in informal testing, defeated .45 ACP handgun ammunition. Developed by Natick Laboratories (now the Combat Capabilities Development Command Soldier Center) and introduced in 1967, T65-2 plate carriers were the first vests designed to hold hard ceramic plates, making them capable of stopping 7 mm rifle rounds.