McDonald, ?

On our Nominal Roll we have two McDonalds: McDonald, A.B (Ab) and McDonald S.
This is definitely not Ab. but we have no idea if this is "S" or someone else.
If anyone can help us propely identify this person please get in touch at the address below.

If anyone can help us out with a first name and other details of Pte. McDonald's service
please get in touch with us at the following address: