Medium Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Confusion
Conflict Airborne Conflict
Air Traffic Control Issued New Clearance; Flight Crew Took Evasive Action
Airspace Structure; Human Factors; Procedure
Received a climbing TCAS RA on descent into VPS at 6;000 feet.No TA warning; just out of nowhere we received a RA to Climb with an (red) alert -500 off our right wing. Complied with RA; notifying ATC. FO (First Officer) claims to have seen a military drone; as we were just outside military airspace. I did not see the aircraft at all. ATC reissued a new clearance with us; and seemed to be unconcerned by our climbing RA alert.Close call with TCAS alert.
Air Carrier Captain reported receiving a TCAS RA which may have been caused by a military drone.