ok, well if you really want to know what absolutely, positively will never ever wash off i'll tell you. black spray paint. i dont know how this kid in my platoon got it through pick-up, matter of fact i dont even want to know, but that sh*t was money. after the first couple of nights, when things settled down, he busted out the spraypaint and as many of us as was possible painted the big G and our plt # on our shirts. i never once had to remark anything, and it looked damn good the whole time. if you do this, just be sure to put something in between the layers of the shirt so it doesnt soak through to the front.
also, whilst we're on the subject of spray paint--before i left for OCS i went to wally world and bought their standard 1/2" stencil cut-outs, some black fox river mil. bootsocks (Sportsman's Warehouse), and a can of white spraypaint. painted my last name on the socks and didnt lose a one at OCS. matter of fact, i have worn those socks just about every day (no really) since then (JUN-AUG '05) and theyre still holding up strong. although, I did get ripped bigtime during the PLT SGT's inspection for the socks, but hey...nobody passes that inspection. hope this helps, damn this turned out long
