The official description
This document is a Range Fouler Reporting Form, a standardized reporting form the U.S. A U.S. military operator reported tracking a “round, cold object” over the Gulf of Aden for eight minutes via “black hot” IR sensor, making the UAP appear “bright white.” The report states that the UAP was “traveling 168 degrees at 277 mph” and “made a few abrupt directional changes” during the encounter.
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.