Maria I understand your problem, my father was posted to the British Army and I can't find anything about that period of his service. You maybe should put in a request for your father's service record to the National Archives. It would be a beginning and maybe from there you can trace his movements. There are plenty of people on his board prepared to help you with the abbreviations used in military records. Feel you can contact me anytime.
The following web site may help you in your quest.

http://www.mapleleafup.org/locator/research.html

Cheers

Art J.