Jim;
Some answers:
No.7 DD - No. 7 District Depot
A-30 CITC - A30 Canadian Infantry Training Centre
Trg Bde - Training Brigade
4CIRU - No. 4 Canadian Infantry Reinforcement Unit
N S Regt - North Shore Regiment
T.O.S Taken on Strength - joining a unit (Gaining Unit)
S.O.S Stricken off Strength - leaving a unit (Losing Unit)
Sorry, this is short, have to run.
Cheers