No expert on war wounds - but shouldn't shapnel be moving fast enough to require more than bacitracin? How can shapnel lodge so close to the surface that mere bacitracin (no stitches, etc) suffice?
Sounds to me like a SPLINTER.
Sorry - but only a pansy would accept a Purple Heart for this! (Please forgive the insult to those alternative lifestyle folks with courage...can't come up with a term to describe someone like this)