The first attempted launch of a D-21B was on 28 September 1967, although the drone fell off the B-52's launch pylon resulting from a stripped nut on the pylon before the aircraft arrived at its meant start position. Johnson admitted that the incident was "quite embarrassing". 3 a lot more https://kameronpwchn.empirewiki.com/7396657/5_easy_facts_about_lkw_plane_described