I think I've seen that particular headstone pic before ... if it's a military cemetary, I would guess it's the one in Normandy ... Stones at Arlington National Cemetary are the more conventional headstone shape, with the religious symbol engraved on the stone above the name.
There are attempts being made to add to the list of already-approved religious symbols available for military headstones.
Witchvox Article
Pagan Headstone Campaign