The official description
This document is a Range Fouler Reporting Form, a standardized reporting form the U.S. A U.S. military operator reported observing a “round, cold object” via infrared sensor, traveling at 319 degrees (northwest) at approximately 20 mph. The report describes the UAP making “abrupt directional changes” during the event.
Quoted from the U.S. Department of War, PURSUE UAP releases. Read every file for this incident in Official files or at war.gov/UFO.