Ivor
Thanks for that.
Actually he did not resign to join the ADRIC - more he had to resign at the end of the war. What he actually had was a "tempory commission" as in
1918 Nov 3. The undermentioned are granted temp commns. as 2nd Lts. (O.): —. G. A. Body (2nd Lt., E. Kent R., T.F.).
So when the war ended they had to resign. They could then sign up for the Auxiliaries, but that was not a "army" job, it was "civilian". The pay was good by the standards of the time. An Auxiliary who died in Ireland did not get a War Grave, but an soldier did.
After that they could join the "Reserve of Officers", but that was not a job. If they wanted a full time job, then they had to re-apply for an army commission, or if that was not forthcoming, they resigned their Reserve Commission and could then accept a position in the ranks. Which is what I assume G A Body did.