An F-104 Starfighter collides with XB-70 Valkyrie prototype no. 2, destroying both aircraft during a photo shoot near Edwards Air Force Base. Joseph A...

An F-104 Starfighter collides with XB-70 Valkyrie prototype no. 2, destroying both aircraft during a photo shoot near Edwards Air Force Base. Joseph A. Walker, a NASA test pilot, and Carl Cross, a United States Air Force test pilot, are both killed.