Am new to all this so I hope I am posting in the right place. Got a hold of a bayonet. Found out on the net it is a M3 Trench Knife. But I can't find my specific lettering referenced "anywhere". Mine has U.S. M3 A.C.C. on the guard between the blade and handle. I can find some that reference "Imperial" and such but none with the "A.C.C." Can anyone help with the history? I really would appreciate any info. Thanks "Fuzzy"Mike