Marines don't salute in doors, unless they are 'under arms' (carrying weapons).
Without a weapon, how is a serviceman in the White House materially different than any normal doorman or butler?
With a weapon, they're no better than any other joe at the range.
There's a lot of them in one place and they'll obey commands to fire instead of running away screaming like little girls. That's basically it.
Shot with a handful of mil and police and have been completely unimpressed by their shooting. Some of them seem like they never picked up a gun.
They have prettier uniforms.
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