One of the first two U.S. combat pilots in the air on the morning of Tuesday, Sept. 11, 2001 took off from Andrews Air Force Base in an F-16 with a mission to bring down United Flight 93 — and without any missiles or ammunition. “We wouldn’t be shooting it down. We’d be ramming the aircraft,” Lt. Heather “Lucky” Penney said describing her orders to The Washington Post. “I would essentially be a kamikaze pilot.” The fourth recently identified hijacked plane appeared to be on a heading for Washington, and there was no time to arm the base’s fighter aircraft...