Air carrier captain reported receiving a TCAS RA which may have been caused by a military drone.

Attributes
ACN	1608037
Time
Date	201901
Local Time Of Day	1201-1800
Place
Locale Reference	VPS.TRACON
State Reference	FL
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Medium Large Transport Low Wing 2 Turbojet Eng
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Instrument Flight Crew Multiengine
Events
Anomaly	Conflict Airborne Conflict

Narrative:

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. First officer (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.

Original NASA ASRS Text

Title: Air Carrier Captain reported receiving a TCAS RA which may have been caused by a military drone.

Narrative: 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.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.