Read something that the mossie were used as pathfinders for night time bombing raids. If memory services me correctly, RAF used a aerial blind bombing targeting systems call "Oboe". The mossie (not sure what variant it would be) would be equipped with the system and stray a head of the lead bomber. When the mossie gets the single that they are directly on target, they would triangle their position with the lead bomber and fire a green flare if they are on target, red or yellow if they need to go left or right to line up to the target.