The official description
The United States Northern Command submitted a report of an unidentified anomalous phenomenon to the All-domain Anomaly Resolution Office (AARO) consisting of 39 seconds of video footage from an infrared sensor aboard a U.S. military platform in 2016. Video Description: 00:01-00:11: The sensor zooms in and out to track on an area of contrast, panning to keep it generally within the center of the frame. 00:12-00:29: The sensor switches modes. A white reticle surrounds the area of contrast. 00:30-00:36: The sensor stops tracking the object, causing it to exit the right side of the frame. 00:37-00:38: An area of contrast enters the sensor field-of-view from the right side of the frame.
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.