Here's an easy way to create a British fighter ace. Using the mission
 builder create a mission with six BF-109s on one runway and six on
 another runway nearby but only to thell them where to take off and
 land and don't give them anywhere to fly to. Fly in a Spitfire MkII
 and start the mission near the runways. Strafe the planes on the
 ground. Destroy them all. Return to base and you should get 152
 points. Repeat this milrun mission 10 times and you get all the
 medals and should be promoted to Group Captain.