Location not stated reported triangle delta observation — July 15, 1950

On or during July 15, 1950, at or near Location not stated, the source reports the following sequence: A-1917) Enclosed herewith is report of unconventional aircraft sighted over Redstone Arsenal, 15 July 1950. The image shows a diagram or sketch depicting the flight path and description of an "unconventional aircraft" observed near Redstone Arsenal in Alabama on July 15, 1950. [REDACTED] first noticed the non-conventional aircraft in the sky about thirty degrees North East of the right hand corner of Civilian Bachelor's Quarters. Flying at approximately 1,000 feet elevation at a judged air speed of 100-125 miles per hour in a level flight. In regard to the flight of said object: It followed a line parallel for approximately 5 to 8 miles, when object reached a line parallel with the Quarry pit located on the North West side of Redstone, the object appeared to first be in some type of flight trouble, that is to say the triangles were seen to move or flop, one the leading section turning in a clock-wise motion and the rear section in a counter-clock-wise motion.