Iran launched a missile attack Monday on a U.S. military base in Qatar and Iraq, retaliating for the American bombing of its nuclear sites and escalating tensions in the volatile region. The following map shows where the U.S.’s other key military bases near Iran.

It remained to be seen whether the attack would ignite a regional war or provide the U.S. and Iran with an off-ramp from their intensifying confrontation.

The Pentagon already had begun taking measures to strengthen its firepower in the Middle East and protect U.S. bases there.