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Identification, friend or foe (IFF) is a combat identification system designed for command and control. It uses a transponder that listens for an interrogation signal and then sends a response that identifies the broadcaster. IFF systems usually use radar frequencies, but other electromagnetic frequencies, radio or infrared, may be used. [1]
IFF Mark X was the NATO standard military identification friend or foe transponder system from the early 1950s until it was slowly replaced by the IFF Mark XII in the 1970s. It was also adopted by ICAO, with some modifications, as the civilian air traffic control (ATC) secondary radar (SSR) transponder.
Friend or Foe, a 1982 British film by John Krish; Friend or Foe, a 2002–2003 American game show that aired on Game Show Network; Friend or Foe (SpongeBob SquarePants), 2007 SpongeBob SquarePants episode "Friend or Foe" , 2024 Squid Game episode
Secondary surveillance radar antenna (flat rectangle, top) mounted on an ASR-9 primary airport surveillance radar antenna (curved rectangle, bottom).. The need to be able to identify aircraft more easily and reliably led to another wartime radar development, the Identification Friend or Foe (IFF) system, which had been created as a means of positively identifying friendly aircraft from unknowns.
IFF Mark II was the first operational identification friend or foe system. It was developed by the Royal Air Force just before the start of World War II. After a short run of prototype Mark Is, used experimentally in 1939, the Mark II began widespread deployment at the end of the Battle of Britain in late 1940.
A pair of CIPs mounted on the side of an M1A1 Abrams' turret. The Combat Identification Panel (CIP), also known as a Coalition Identification Panel, is an Identification friend or foe device mounted on military ground vehicles used by United States Armed Forces' United States Army with United States Marine Corps and its allies to distinguish them from the enemy during battle.
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Enemy comes from the 9th century Latin word inimi, derived from Latin for "bad friend" (Latin: inimicus) through French. [3] " Enemy" is a strong word, and "emotions associated with the enemy would include anger , hatred , frustration , envy , jealousy , fear , distrust , and possibly grudging respect ". [ 2 ]