The military term for something intruding into airspace where it should not be, such as a training range or operating area. The US Navy uses a standardised form to log these intrusions, and several Range Fouler debriefs appear in PURSUE Release 01.
The form is structured: date, time, location, altitude, the observer’s crew position and a description block. It carries an explicit note that the reports are sanitised of identifying information before analysis, handled through SPEAR. The existence of a routine, structured intake form is itself meaningful: it shows the military treats airspace incursions by unidentified objects as a recurring operational problem with its own paperwork, not as a novelty.