By 13 April, the U.S. had installed and activated Patriot air defense systems which have anti-ballistic missile capabilities, an Army C-RAM system, and an AN/TWQ-1 Avenger at Al Asad Airbase and the base at Erbil, and at Camp Taji, after gradually moving the systems into Iraq since the attack., TEHRAN, Iran (AP) — Iran struck back at the United States early Wednesday for killing a top Revolutionary Guards commander, firing a series of ballistic missiles at two military bases in Iraq housing American troops in a major escalation between the two longtime foes., The US military's Central Command said an Iran-backed militia targeted the Al Asad airbase, which hosts American troops, with ballistic missiles and rockets on Saturday evening., More than 100 American troops were diagnosed with traumatic brain injuries in the aftermath of the Iranian missile attack. This is a breaking news story and will be updated., Ballistic missiles fired by Iran caused explosions near the U.S. consulate and a U.S. military facility after a missile struck Erbil in northern Iraq, officials said Monday., In November, militants in Iraq fired close-range ballistic missiles at coalition forces, prompting the US to carry out airstrikes against facilities used by the Iranian-backed group Kataib.