York's Minster faces the old financial monumental dilemma: being historically and architecturally important doesn't pay the bills. One way to address this was by allowing the creation of regimental chapels after World War. (As you remember, that was the war to end all wars. Naiveté in war planners didn't begin with the Neocons, if that's any comfort.) Chapel space would be used to memorialize those soldiers in the battalion who had died during the conflict in exchange for funds to support the church.
Several regimental chapels are found in the Minster. (Recall the St. Cuthbert chapel previously discussed). On the edge of the North transept sits The St. John's KOYLI Regimental chapel, dedicated to the King's Own Yorkshire Light Infantry (hence the acronym KOYLI) dedicated in 1926. The regiment went out of existence in 1968 but its chapel lives on, with the names of its famous battles displayed on the screen that separates the chapel from the North transept aisle just to its east.