Okay, to be clear, ALL US Embassies are guarded by Marines. It’s a 3 year B-billet some Marines serve across the world for a year at each duty station. There’s a school for MSG at Quantico. As for why, for one, Marines have great PR as the toughest the US military has to offer (which has a bit of truth to it, but is greatly exaggerated). Marines are also generally used as shock troops and escorts, naturally leading to a general infrastructure of an [perceived] elite guard pipeline. Also, those blues uniforms look damn good, which is also why it’s generally Marines that are the guards front and center around the white house.
In terms of who generally staffs US military bases, it depends on which branch is stationed there. All branches have their own MPs as an MOS or job. Marines are pretty much just on the US coasts and Japan. The Other branches are pretty much all over, though. Lots of them are mixed, too. But usually the staff is gonna be Army, Navy, or [ch]Air Force, depending on the purpose of the base. National Guard is really only gonna be staffing their own bases in their state, or filling in somewhere under one of the Federal branches as a “deployment”.
Okay, to be clear, ALL US Embassies are guarded by Marines. It’s a 3 year B-billet some Marines serve across the world for a year at each duty station. There’s a school for MSG at Quantico. As for why, for one, Marines have great PR as the toughest the US military has to offer (which has a bit of truth to it, but is greatly exaggerated). Marines are also generally used as shock troops and escorts, naturally leading to a general infrastructure of an [perceived] elite guard pipeline. Also, those blues uniforms look damn good, which is also why it’s generally Marines that are the guards front and center around the white house.
In terms of who generally staffs US military bases, it depends on which branch is stationed there. All branches have their own MPs as an MOS or job. Marines are pretty much just on the US coasts and Japan. The Other branches are pretty much all over, though. Lots of them are mixed, too. But usually the staff is gonna be Army, Navy, or [ch]Air Force, depending on the purpose of the base. National Guard is really only gonna be staffing their own bases in their state, or filling in somewhere under one of the Federal branches as a “deployment”.