Do Tomb Sentinels Carry Loaded Weapons?

Aside from getting manhandled (and probably tazed) by the Arlington Police, the Tomb Sentinels are carrying fully functional weapons. Whether they're loaded weapons or if the sentinels have ammunition remains unknown (many sources say they don't), but that's not a reason to go testing the theory.

Can tomb guards shoot you?

Can tomb guards shoot you? The guards are fully authorized to shoot you. ... If you do not back off or worse attack the guard or the Tomb he will put you down like the worm you are. That weapon he carries might be ceremonial but it's completely functional.

What weapon do the tomb guards carry?

The M14 is the standard ceremonial weapon used by the 3d U.S. Infantry (The Old Guard) today, and is the current weapon carried by Tomb Guards.