thegypsy
Your Father's course I think must have been in the UK, as the first USA designated cadets were Class 42A on the Arnold Scheme, they actually (as 42A Suggests) were planned to graduate with wings in January 1942 (although I think Reg you graduated in December 1941?). So the first cadets would be coming back from the USA when your Father crashed.
When I counted how many survived in some of the courses in 1942 it was somewhere between 40 to 50% had died. However as the war went on the rate changed with the prevailing battles. i.e in 1940 we needed fighter pilots as the UK was being attacked, however later in the war when we went on the offensive we needed more Bomber and Ground Attack pilots.