I'm hoping that someone will be able to help me understand what my Dad would have been doing while he was posted to the following locations. I understand that these postings would have been for training purposes - but training in/on what? He joined the RAF in December 1937 and spent his career there as a member of the ground crew (an Erk??) until demobilization in early 1946.

16 Dec 37 1 Depot Uxbridge
25 mar 38 3 S of TT (M)
08 Jun 38 3 Wing Henlow
30 Sep 38 3 Wing St. Atham
08 Nov 38 4 Wing St. Atham

Thanks, Bronco