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In page Flechette:

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During the Vietnam War 105 mm howitzer batteries and tanks (90 mm guns) used flechette rounds to defend themselves against massed infantry attacks. The ubiquitous 105 mm M40 recoilless rifle was primarily used as an anti-tank weapon. However, it could also be used in an anti-personnel role with the use of flechette rounds. The widely used Carl Gustaf 8.4 cm recoilless rifle also uses an Area Defence Munition designed as a close-range anti-personnel round. It fires 1,100 flechettes over a wide area.[1] The US Air Force used 2.75 in (70 mm) rockets with WDU-4/A flechette warheads.[citation needed]