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| {{Status|Canon}} | | {{Era|Human|UNSC|HCW|Post}} |
| [[File:IFFtags.jpg|thumb|IFF tags identifying UNSC soldiers.]] | | [[File:IFFtags.jpg|thumb|IFF tags identifying UNSC soldiers]] |
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| '''Identification friend or foe''', or '''IFF''', is a system used by the [[UNSC]] and [[Covenant]] to tag friendly or hostile units for easy identification on a [[heads-up display]] or [[motion tracker]].<ref>'''[[wikipedia:Identification friend or foe|IFF at Wikipedia]]'''</ref><ref>'''Halo: Contact Harvest''', ''page 178''</ref> The equipment of a friendly unit generates a signal on a specific frequency, which is interpreted as a "friendly" signal by the receiver. If a signal is not generated, then unit is tagged as a hostile. Friendly units appear as yellow dots on the motion tracker, while the crosshairs of a HUD turn green when pointed at them. Hostile units show up as red on a motion tracker, and the HUD crosshairs turn red. | | '''Identification friend or foe''', or '''IFF''', is a system used by the [[UNSC]] to tag friendly or hostile units for easy identification on a [[heads-up display]] or [[motion tracker]].<ref>'''[[wikipedia:Identification friend or foe|IFF at Wikipedia]]'''</ref><ref>'''[[Halo: Contact Harvest]]''', ''page 178''</ref> The equipment of a friendly unit generates a signal on a specific frequency, which is interpreted as a "friendly" signal by the receiver. If a signal is not generated, then unit is tagged as a hostile. Friendly units appear as yellow dots on the motion tracker, while the crosshairs of a HUD turn green when pointed at them. Hostile units show up as red on a motion tracker, and the HUD crosshairs turn red. |
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| All UNSC personnel are implanted with a [[neural interface]] containing an IFF transponder.<ref>'''Halo: Mortal Dictata''', ''page 292''</ref> Weapons like the [[MLRS-2 Hydra]] use an integrated IFF interrogator in its targeting systems to prevent friendly units from being targeted by the guidance system.{{Ref/Game|HI|In-game Hydra weapon|Detail=[[:File:HINF HydraIFF.png|Decal details]]}} Additionally, most UNSC ships, ranging from civilian [[freighter]]s to [[UNSC Navy]] [[warships]], possess IFF transponders displaying their identity, allegiance, and classification.<ref>'''Halo: Contact Harvest''', ''page 176''</ref>
| | In the ''[[Halo 2]]'' level, ''[[Gravemind (level)|Gravemind]]'', [[John-117]] managed to rescue a dozen UNSC prisoners of war. This was due to [[Cortana]] identifying their "IFF transponders", which were still with the Marines. |
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| During the [[Fall of High Charity|fall of High Charity]], [[John-117]] managed to rescue several [[UNSC Marine]] [[Prisoner of war|prisoners of war]]. This was due to [[Cortana]] identifying their IFF transponders, which were still with the Marines.<ref>'''[[Halo 2]]''', campaign level ''[[Gravemind (level)|Gravemind]]''</ref>
| | Most UNSC ships, ranging from civilian [[freighter]]s to [[UNSC Navy]] [[warships]], possess IFF transponders displaying their identity, allegiance, and classification.<ref>'''Halo: Contact Harvest''', ''page 176''</ref> |
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| Following the [[Human-Covenant War|fall]] of the Covenant, the [[Swords of Sanghelios]] and [[Jul 'Mdama]]'s [[Jul 'Mdama's Covenant faction|Covenant]] utilized "semi-feral" associated intelligences to operate {{Pattern|Upisa'weri|Shrike}} turrets. As these constructs had been long abandoned, they could not communicate with modern [[Sangheili]] and had to be carefully monitored and locked down prior to activation due to their inability to understand contemporary IFF systems and codeword usage.<ref>[https://www.halowaypoint.com/en-us/universe/weapons/shrike-turret '''Halo Waypoint''': ''Shrike Turret'']</ref>
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| ==List of appearances== | | ==List of appearances== |
| *''[[Halo: Combat Evolved]]'' {{1st}} | | *[[Halo: Combat Evolved]] {{1st}} |
| *''[[Halo: The Flood]]'' | | *[[Halo: The Flood]] |
| *''[[Halo 2]]'' | | *[[Halo: Contact Harvest]] |
| *''[[Halo: Landfall]]''
| | *[[Halo 2]] |
| **''[[Halo: Combat]]'' | | *[[Halo 3]] |
| *''[[Halo 3]]'' | | *[[Halo 3: ODST]] |
| *''[[Halo: Contact Harvest]]'' | | *[[Halo: Reach]] |
| *''[[Halo 3: ODST]]''
| | *[[Halo 4]] |
| *''[[Halo: Reach]]'' | |
| *''[[Halo 4]]'' | |
| **''[[Spartan Ops]]''
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| *''[[Halo 5: Guardians]]''
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| *''[[Halo: Shadow of Intent]]''
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| *''[[Halo: Silent Storm]]''
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| *''[[Halo Infinite]]''
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| ==Sources== | | ==Sources== |
| {{Ref/Sources}}
| | <references/> |
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| [[Category:Communications technology]] | | [[Category:Communications technology]] |
