There is one other example that I forgot about just for fun and to show anything is possible I suppose LOL. An actual Marine Corps photo found listed as Okinawa 1945. Looks like he may have taken the horseshoe to the kisser before he added it along with the EGA to his helmet... ... but no doubt happy to have made it alive through the battle!
This one's great! Almost makes me want to start a thread specifically for personalized helmet covers, but that probably already exists!