My Dad's Soldier's Service & Pay Book is in an Army Will envelope and on the front of the envelope it give his Soldier's Regimental number 1550117 his name John Bonner and stamped next to Corps is R. A. (C.D. & A.A.). Also stamped in the corner is a triangle with A.C. Corps in it. Going by his medical information he had been with them since at least April 1940 and he did a couple of cooking courses in 1941 & 1942 in Glasgow (he was born in Glasgow). There is no other information in the book, apart from some dates he took leave, so can anyone please tell me what they think the abbreviations that I have put in bold mean. I think I know but would like to see what others think.