- aself-propelledhowitzer.Copperheadsarespecial155mmprojectilesemployedbylaterversionsoftheM109seriesandtheM198howitzer."Cannon:Long-rangeartillerypiece,asdistinguishedfromotherBiggunssuchasthehowitzerormortar."Oneresultingscandal,involvingagentsinaB...
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