You really don't need the bore evacuator on a smaller caliber main gun the turret blower is all you really need.
Almost all NATO standard cannon ammunition is ammonia -based, after firing several rounds, blowers get switched on and hatches get cracked! Another problem on AFVs without escape hatches, is the practice of using a spent case as a piss tube, not so nice on a hot day....
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The reason that the American Army does so well in wartime, is that war is chaos, and the American Army practices chaos on a daily basis.
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