Which of the following is not a common method for marking targets for aircraft?

• A. GPS transponder beacon on the target.
• B. Day/night marker via smoke.
• C. Laser designation.
• D. IR marker.

Answer: (D)

Marking targets for aircraft relies on cues that aircrews can quickly recognize and correlate with coordinates or directions under combat conditions. GPS transponder beacons on the target provide precise location data that aircraft can home in on with their nav and attack systems. Day or night markers using smoke create a clear, visible cue that works across lighting conditions without requiring specialized sensors. Laser designation actively points to a specific spot, guiding precision munitions with high accuracy. An infrared marker, while possible, is not as widely used because it depends on compatible IR sensing on the aircraft, can be obscured or confused by environmental heat or smoke, and isn’t as universally reliable or available across all platforms and missions. For those reasons, infrared markers are not as common as the other methods.