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The question remains; who took the picture?
Pretty sure that's a Garand??You should study weapons ID a little more.
Tomb Guards carry fully functional M14 rifles. Given what happened in Canada 5 years ago, I'd guess it was loaded too. FAQ - Tomb of the Unknown SoldierNot funny really, but I swear this honor guard locked/loaded on that Garand in the first few seconds. The rest is gold
No magazine visible in the M-14 nor on the guard's equipment. I don't think he had any ammo.