NASA test pilot Joe Walker is killed when his Lockheed F-104 makes contact with the No. 2 North American XB-70 Valkyrie in flight, gets caught in vortices coming off the Valkyrie’s wingtips, and rolls through the XB-70’s twin tails. XB-70 copilot Carl Cross is also killed and the Valkyrie, one of only two built, is destroyed.
The U.S. sent Air Force F-16s over central Syria in a show of force following the Dec. 13 killing of two U.S. Army Soldiers and one American civilian interpreter by a gunman linked to the Islamic State group.
