No need to be the world's traffic cop with 900 overseas bases and personnel in 130 countries.. Pull back and let the nasties take each other out.

If they decide to cross the midpoints of the Atlantic or Pacific, let the Navy & Air Force deal with them. The Army can play with unfriendly parts of Mexico and Venezuela. The Coast Guard can keep Canada and the Caribbean islands from getting uppity. See? Everyone gets to play. The Marines, you ask? Well, that's just the Navy's army... They go where the ships go.

Seriously, let the Muslim countries have the Middle East and N. Africa. Without a colonial power over them, they will tear themselves apart.