My grandfather served in the Kings Own Yorkshire Light Infantry in WW2.

The facts I know from a postcard are:

Stanley Morton
4687457 - L/C Morton - 1/ KOYLI - 8th army
WO-C.O.Y.M.T.SEC.C.M.F

Could anyone help me understand what this means?

I'm also trying to find out where he would have served throught the war from him joining in 1939 to getting home in 1945.

My grandma died of illness in April 1944 and he couldn't get home - I'd love to know where he would have been serving at the time.