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In page Flak jacket:

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Col. Grow’s request to the Wilkinson Sword company was to develop a vest that could stop a .45 caliber round fired at close range.[1] Although flak jackets offered some basic protection against small caliber bullets and shell fragments (which was valued by their users),[2] ultimately they proved to be less effective than hoped. Flak jackets are now generally considered to be inferior to ballistic vests.