The echoes of marching feet and the weight of duty once defined a generation in Britain. Conscription, the mandatory enlistment into military service, wasn’t a constant in the nation’s history, but rather a response to the overwhelming demands of two world wars. From 1916 to 1920, and again from 1939 to 1960, young men answered the call, their lives irrevocably altered by the conflicts that raged across the globe.