WASHINGTON (AP) — The U.S. government admitted Wednesday that the Federal Aviation Administration and the Army played a role in causing the collision last January between an airliner and a Black Hawk helicopter near the nation’s capital, killing 67 people. The official response to the first lawsuit filed by one of the victims’ families said that the government is liable in the crash partly because the air traffic controller violated procedures about when to rely on pilots to maintain visual separation that night. Plus, the filing said, the Army helicopter pilots’ “failure to maintain vigilance so as to see and...