Crispen Nissen served as a sergeant in the U.S. Army Air Corps with the 12th and 18th Weather Squadrons during World War II in the United States, England, North Africa, and Italy. This collection includes an original diary Nissen kept from 1941-1942, describing his daily thoughts, experiences, and observations about the general war effort. The collection also includes Vmail and handwritten letters, written by Nissen to his fiancee and future wife, Etrulia Ellis, as well as the letters she sent to him.