There are many types of kill streak rewards in "Call of Duty: Black Ops 6". When you kill multiple enemies, you can get a kill streak reward, and HARP is one of the kill streak rewards. HARP's Its function is to summon a powerful unmanned reconnaissance aircraft, which will not be destroyed by attacks.
What is the use of 6HAP in Call of Duty 21 Black Ops
HARP, the killstreak reward, is a greatly upgraded version of the drone. Like drones, HARPs are able to reveal enemy locations on the mini-map.
Moreover, HARP's intelligence is more detailed, revealing the exact location and direction of all enemies on the battlefield in real time.
Additionally, unlike drones, HARPs cannot be destroyed by anything else. Only Counter-Drone can temporarily disable its effect.