A US Air Force MQ-9 Reaper with a more common loadout consisting of AGM-114 Hellfire air-to-ground missiles and an underwing fuel tank to extend its range. USAF
Military.com: MQ-9 Gets First Air-to-Air Kill in Training Exercise, Air Force Official Says
NATIONAL HARBOR, Md. -- An MQ-9 Reaper drone has bagged its first air-to-air kill of another small, aerial vehicle in a controlled simulation, an official revealed to Military.com this week.
The successful test late last year showed the U.S. Air Force that an unmanned vehicle like the MQ-9 has the ability to conduct air-to-air combat, much like its manned fighter brethren such as an F-15 Eagle or F-22 Raptor, according to Col. Julian Cheater, commander of the 432nd Wing at Creech Air Force Base, Nevada.
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Update #1: Top drone: Reaper scores drone kill in air-to-air missile test (Ars Technica)
Update #2: Heat-Seeking Missile-Armed MQ-9 Reaper Shot Down Target Drone During Exercise (The Warzone/The Drive)
WNU Editor: This test was done last year, but we are only learning about it now. The day when drones are used to shoot down other drones and/or aircraft has just taken one big step forward.