Jen,
You're in luck. Samuel's Army service records have survived (one of the 30% or so that were not destroyed by the Luftwaffe during WW2).
There are about 21 pages of his records available on Ancestry, though not every page contains information - many are simply incomplete forms.
If you would like assistance with them, please PM me - I believe it is not permissible for me to post them here for you.
Kind regards,
Peter.