Yes, it's across the street between terminals 1 and 2, so you dont have to pass through security to get here. Staying overnight isnt a problem.
Not if you are retired. The USO doesn't allow retirees to stay after 10pm.Ghost Rider's answer is out of date. The USO moved in June 2018. It is now in the Theme Building (in the building shaped like a spaceship). The entrance is across from terminal 6. It is between the old USO and terminal 6. Only active duty and their dependents are allowed in between 10pm and 4am.
Yes you can stay overnight if retired. I did it last year. The only restrictions are if they're crowded then retired military can't stay.
Yes, it's outside security
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