I saw a guy in basic training, had accidently stuck mud in the flash hider of his M-14, when he shot it, the "fingers" of the hider were splayed out just like a Bugs Bunny/Elmer Fudd cartoon! (1960's, the M-14's were semi-auto only in basic.) I don't think they made a big deal out of it, it was simply an educational accident! BTW, that the L&C Expedition did all that, and lost no guys in the doing, is amazing! They were all Army, so maybe that was to their advantage; were used to some organized discipline.