Locals were guarding the compound.
40 plus years ago I learned to watch my local guards extremely carefully. When they didn’t show for duty or couldn’t be found I went to the best bunker on base with a portable radio and all the ammo I could put my hands on. After the third event the newbees were following my lead John Wayne syndrome or not.
Other posts and yours have now explained why locals were guarding instead of marines?
I’m starting to get it now.