Military
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 12
Communication Breakdown
Aircraft Equipment Problem Less Severe; Conflict NMAC; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Air Traffic Control Issued New Clearance
Aircraft; Airspace Structure; Human Factors
Aircraft X contacted approach requesting course rules. I radar Identified Aircraft X and advised the aircraft they were off of the predetermined route for course rules runway 14 at NSE. I instructed Aircraft X to fly heading 270 and descent to 1700 ft. Aircraft X would not respond on the altitude. I had another aircraft that was on the pre-determined route at 2700 ft. and they were converging. I attempted to issue traffic and control instructions to keep the two aircraft apart. The two aircraft were on an intercept at the same altitude and neither aircraft would respond. I attempted to make several transmissions to both aircraft and separate the aircraft however I was not successful until they were not a factor. In my opinion the aircraft were both in a very close and dangerous proximity. I felt that the aircraft we're going to have a midair collision. After the aircraft were separated I vaguely remember asking why the pilot of Aircraft X would not respond and what was going on and that it was one of the most unsafe situations I have seen. [I recommend the military] be briefed on this event and the important of responding to ATC.
P31 TRACON Controller reported a military aircraft not responding to ATC resulted in a NMAC.