SOS = Struck Off Strength (removed from a unit nominal roll)
TOS = Taken On Strength (joined or enlisted)
North Bay and Shilo look like training centres. I'll try to dig up the info.
Remainder look like units. 2GREEKBN could be 2nd Greek Battalion. I'll check on these also.
FIELD = Battlefield (ie. He was deployed out to the battlefield.)
I'm not sure about the "x6" in your last 2 lines. Will look into it.
Frank ...
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