Yes, an interesting study with this one Sarah, so it would be good if you could find out a bit more, as you would expect with his background that if he joined up through his own volition he would enter as an officer.
What is also interesting is that he was not with the local regiment (The Black Watch), whereas, if he were a conscript, he would have no choice as to where the army put him.

The Wall Street Crash that would have a roll on effect leading to the pandemic Depression did not start until 1929, therefore all throughout the 1920s, Stockbrockers, even in this country, would presumably be amassing their fortunes.