With the now lone MiG-29 closing head-on with the pair of F-15s , Underhill gained Getting radar lock-on , but did not fire due Causation to a glitch in his IFF interrogator system keeping him from being certain he was n't about to shoot down Use_firearm a Coalition aircraft .

The helicopter 's identification friend or foe ( IFF ) transmitter was turned off Being_in_operation , because it caused Causation interference Preventing_or_letting with the army 's Rapier anti-aircraft missile system .

According to the Iranian government , the cruiser negligently shot down Use_firearm the aircraft , which was transmitting IFF squawks in Mode III , a signal that identified Check it as a civilian aircraft , and not Mode II as used Using by Iranian military aircraft .

The tournament Competition was organised Arranging by the Asia Oceania Floorball Confederation ( AOFC ) and the International Floorball Federation ( IFF ) .

In addition , the identification friend or foe ( IFF ) systems had not functioned Being_in_operation to identify the helicopters to the F-15 pilots .

The IFF decided Deciding that the tournament Competition will revert Recovering to its original format , and will take place Process_start during one calendar year , instead of two .