The M3 trench knife or M3 fighting knife was an American military combat knife first issued in March 1943. == Design == Designed for rapid production using a minimum amount of strategic metals and machine processes to maximize efficiency, the M3 trench knife used a relatively narrow 6.75 in (17.1 cm) bayonet-style spear-point blade with a sharpened 3.5 in (8.9 cm) secondary edge.
The M3 trench knife or M3 fighting knife was an American military combat knife first issued in March 1943. == Design == Designed for rapid production using a minimum amount of strategic metals and machine processes to maximize efficiency, the M3 trench knife used a relatively narrow 6.75 in (17.1 cm) bayonet-style spear-point blade with a sharpened 3.5 in (8.9 cm) secondary edge.
Source: Wikipedia "M3 trench knife" · CC BY-SA 4.0
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