An Intercept investigation found 63 U.S. bases, garrisons, and shared facilities in the region. U.S. troops are “sitting ducks,” according to one expert.

U.S. troops in Iraq and Syria have come under repeated attack in recent weeks, including a rocket attack on al-Asad Air Base in Iraq on Monday that reportedly injured five U.S. military personnel and contractors. The renewed strikes, which began in July, mark a resumption of a low-level war between America and Iran’s proxies in the Middle East that had ebbed earlier this year.

U.S. and allied forces have been attacked more than 170 times during the Gaza war: 102 times in Syria, 70 in Iraq, and once in Jordan. The latter assault, in January, ignited a round of escalatory U.S. counterattacks against Iranian-allied targets that led Iran to rein in its proxies. As Israel has widened the Gaza war in recent weeks, with more provocative attacks in Lebanon, Iran, and Yemen, Iran’s partners have resumed attacks on U.S. outposts across the region.