Hello David, it's been a while; Would depend a bit on the type of Group.Light bombers, such as A-20 carried a crew of 3.Medium such as B-25 carriedcrew of 5, Heavies, B-17 & B-24 carried a crew of 10.My outfit, the 3rd Bomb. Gp. flew both A-20s and B-25s.Our 4 tactical Sqs. probably ran between 250 and 300 men.Figuring Hq. Sq. personell the Gp. would run between 12 to 15 hundred.Our full strenghth was 20 planes per Sq..I'm not sure how many planes the Heavies had per Sq., but you can figure they would have had more personell than we had.