Comment by CamperBob2

An enemy that knows you are doing this has incentive to jam Communications.

The idea being that there is no communication to jam because the drone is fully autonomous. Given that, one needs a foolproof way for it to identify the enemy.

In this case the absence of communication would be what gives it permission to engage. Jamming the drone would not save you, but you could potentially make it attack its own forces if there happened to be any around at the time it comes for you. An IR beacon would make that very hard to accomplish.