Leslie Lee Allen was born in Crowley, Colorado on October 5, 1925 to Robert L. Allen and Julia V. Andrews. For a time, he lived in Denver.
He went to Iowa State College in the Army Student Training Program. He would have graduated in 1947, but instead he went into active service at Fort Logan in Colorado.
Leslie was killed in action at Gros Rederichingen, France on December 19, 1944 while serving with Company A, 345th Infantry Division in General Patton's 3rd Army.