My Grandfather, newly emigrated to the United States, was not accepted in the US forces.. so he returned to England and joined the "Duke of Cambridge's Own 17th Lancers" in WWI
Did you know that England had a "Deaths Head" outfit?
As a matter of fact, two of my grandfathers brothers went back to England and joined the same outfit!

James, George, and Richard Bartholomew

Look closely at the hat pins and collar pins.. "Death or Glory"
And finally I'll leave you with this.....