Speaking of "getting their attention", I wonder if the Army has considered a load of black powder shells for use when return anti-tank fire isn't going to be a problem. Imagine a battalion of M1 Abrams executing a fire mission using black powder rounds... <img src='http://www.goodguysposse.org/forums/public/style_emoticons/<#EMO_DIR#>/shellssm1.gif' class='bbc_emoticon' alt=':shellssm1:' />
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But it would have been too heavy to transport.