U.S. forces have struck Iran's key nuclear sites, drawing threats from Tehran to retaliate, with U.S. military installations in the region a potential target. Following are significant U.S. facilities in the Middle East:BAHRAIN: Home to the headquarters of the U.

The U.S., which has long had major military bases in the Gulf Arab States, moved some aircraft and ships last week that may be vulnerable to a potential Iranian attack and limited access to its largest installation,