Beautiful collection of service rifles.
You need to stick a Mosin-Nagant 1891 in there next to the 1903 Springfield. It was also used as a US service rifle in late summer of 1918. It's the rarest of all US service rifles, some 469,000 were built under contract by Remington, and the US got stuck with about 280,000 of them when the Bolsheviks cancelled the order ( for 3.3 million rifles) after the Revolution. They issued the rifles to US and British troops who served in the North Russia Campaign of 1918, as well as using them to train US National Guard and ROTC units. As a US service rifle, it was designated "US Rifle, 7.62mm, Model of 1916", so its service coincides with the time of the 1903 Springfield.