First, is it just me, or does anyone else think the bullpup rifles look stupid in ceremonial use? I would think the old Enfield bolt guns with bayonet fixed would be a better tool in hand for CQB, if actual gunfire wasn't an option.
Second, gotta go with Boomhauer, a loaded mag in a pouch would be a better idea than six loose rounds. Again, an Enflied with a stripper clip would seem a better idea...
So, dig out some Enfields, polish them up, and issue them.
As for Arlington, I'd rather take on the uniformed rent-a-cop types than membera of the Old Guard...they tend to take that hallowed ground thing pretty seriously, and even an unsharpened bayonet is gonna hurt.