 So an aircraft scramble can be triggered by a number of events, typically it might be an aircraft not complying with the rules of the air, the flight plan hasn't been filed, it's not squawking or identifying itself correctly, or maybe it's not communicating through the radios etc. So anything like that where we don't understand what the aircraft is could initiate a scramble, that decision will get made by NATO and we'll launch to intercept as directed. So during an air interception we'll get our tasking from NATO, the team here will get airborne, they'll identify the aircraft that is either unidentified or not complying and they'll get up close and start to work out what's going on, they'll try and speak to it, they'll try and communicate it, identify what it is and then feed that information back so that further decisions can get made.