B.147208 -- military serial number
Andress C. G. -- last name first
the address I think you have is correct but the
#2 may not belong with it.
Unit name was crossed off in same pencil as
Serial 6 /???; this was the first forwarding. Does the
F at the top of the envelope match? In any case, "F" probably just means "forwarded".
Is there a return address? That would explain an added
#2 / R.R.R. / 12/7/1944 / (initials) in the same handwriting as the original writer. So now the letter was returned to sender and re-sent. "R.R.R." is Royal Regina Rifles (Regina, Alberta).
http://www.reginarifles.ca/ gives WWII unit enrollment, and there he (Andress) is, serial number and all, the asterisk indicating he was wounded. The date (docketing) would probably indicate the date of remailing.
Forwarded again with the red pen crossout matching the ink at top. The first part in red ink seems to be
Dry/ 6/9 -- directory service given on 6 September and not the impossible June 9, with the address following. I believe that is #18 Canadian General Hospital, a military hospital, located in Cherry Tree, England at least in December 1943. That address is crossed off in crayon, so the letter was forwarded again.
That destination would be
R.W.C. HOSP. which I believe to be Roman Way Convalescent Hospital in England. That would follow normal movement from hospital to convalescent hospital.
There should be lists of FPOs with units; can someone enlighten us? Probably just postal units doing the forwarding work, but still ...