we need to fill the gap between 1906 and 1914 when he enlisted in CANADA.
As Jim says his British army service records are available on FindMyPast, and also Fold 3. They show that he served at home (i.e the British Isles) from 1906 until his discharge on 17 July 1912.
Tracking his movements from there, he marries in Bristol in October 1912 and then seems to have travelled to the US: there is a record of him arriving back in the UK from Portland, Maine in December 1912. Then to Canada in 1913. There are records of him having applied for a homestead grant in Saskatchewan in 1909, and receiving the grant in November 1912.
There is a record of him in a Kansas City directory for 1928, so yes he was there.