This collection relates to United States Marine Corps Private First Class William C. Erler who served as a Paramarine, and later with the 26th Marine Regiment, 5th Marine Division during World War II. William C. Erler was killed in action at Iwo Jima on March 2, 1945. The collection consists of photographs and several personal letters and papers, as well as artifacts, a parachute, gas mask, pins, marksmanship badges, and medals, including his posthumously awarded Purple Heart.