What is a device that emits a signal positively identifying it as a friendly?

• A. Fire control beacon
• B. Identification, Friend or Foe (IFF)
• C. SIF transponder
• D. Radar beacon

Answer: (B)

Positive identification of friend or foe relies on a system that reliably confirms who is friendly to avoid misidentification in combat. Identification, Friend or Foe (IFF) is exactly that system. It uses interrogators to prompt responses from friendly units that carry a transponder, which emits a coded signal identifying the asset as a friend. This automatic exchange lets radar and weapons systems distinguish allies from enemies, reducing the risk of fratricide and enabling safer, more precise engagement decisions.

A SIF transponder is a specific component within the IFF system, but the broader, standard term for the capability is IFF. Other options like a fire control beacon or a general radar beacon don’t inherently provide the standardized positive identification of friend or foe that IFF supplies.