The failed strike marks the first time since Feb. 4 that Iranian-backed militias have attacked a U.S. facility in Iraq or Syria.
A search for carcinogens at Vandenberg Space Force Base, California, found low levels of contamination at two sites.
The Air National Guard has delayed personnel changes in Alaska that could have threatened national security and civilian rescue missions.
Gunston Hall returned to the states after taking part in NATO's biggest exercise in decades.
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