Soldier or Marine?

[Marine A5 Sniper Rifle]

I initially thought this to be a Marine, but upon close inspection, I think he is an Army soldier. We know the Army advocated the distribution of scoped rifles into the ranks as early as 1903, but the A5 scope wasn't around in those days. Can any of you knowledgeable uniform guys date this picture from the uniform? The scope is mounted in WRA OEM #2 mounts on 6" centers, and the Army must have had hundreds of these scoped rifles, other than rifle team rifles. Why did the Army need the Warner-Swasey scopes for combat when they had so many A5 scoped rifles?



Pre_WWI Marine w_6inch Spaced A5 Scoped 03.jpg