Hello, i never experienced any issue with IFF in single player, but I'm having some problems in multiplayer (104th server): AWACS is spamming BRA of enemy and my area is clear, i got several contacts on screen (40km preset) from 10 to 30 km to my position , then i decide to IFF interrogate them and one of them is marked not friendly , interrogate again , still not friendly ... so I SST lock him and prepare the 530s and took him down only to learn from the message that it was a friendly F15... during the next hour i had same problem several times (i hold fire instead:P) with contacts that should be blue to me marked neutral/hostile .. is that a common thing in m2k? Afaik IFF in DCS is pretty simple binary thing, so if properly used (nosewheel/IFF button and IFF rotary on left side panel to the rightmost position) should always work, isnt it?