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An Identify Friend or Foe (IFF) system is a device that automatically identifies friendly assets on a battlefield. An IFF system helps soldiers and weapon operators distinguish their allies from their enemies, thereby preventing "friendly fire" incidents. The technology can also be built into "fire and forget" guided missiles, allowing them to select and attack an enemy target after launch without assistance from a weapon operator.

IFF in Science Fiction

  • The Wing Commander video game includes IFF missiles that can be fired into a dogfight without putting wingmen at risk.
  • In Aliens, the Colonial Marines have support weapons called "smart guns" that have IFF features.
  • The Omega-4 mass relay in Mass Effect recognizes IFF devices on Reaper and Collector starships, allowing them safe passage.