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Weapon systems used on the gunships varied from .50 cal., 20mm canon, 40mm grenade launcher, 2.75 and 3.5-inch rockets and 7.62 cal. mini-guns. One of the battalion’s secret weapons was “BIG DADDY”…an M-39 20mm cannon that had a cyclic rate of 1900 rounds per minute with a maximum effective range of 3500 yards. ................
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