After the mission is before the mission. Rehearsals of planned missions are as essential as debriefings and mission analysis for several reasons. Most information is received by visualising the tracks of the aircraft and checking it against the planning. OptaDebrief covers replays of the flights in 3D, 2½D and 2D. With OptaDebrief the user receives a valuable evaluation of missions. The mission event analysis is performed by synchronising the tracks of one or several aircraft with mission events from the tactical data from the aircraft or pilots' information. A stereoscopic 3D debriefing facility offers full awareness of any situation during the flight. OptaDebrief provides mechanisms to select the most important information for the purpose of demonstration or training. It includes mechanisms for archiving and retrieving the debriefing information.