Maurice Arthur Dinneen was born on December 17, 1921, in Saint Louis, City of St. Louis, Missouri. He was the son of Maurice A. Dinneen. He was married to Joan M. Clark Carr. He enlisted in the service on July 23, 1942. He served in the 734th Bomb Squadron, 453rd Bomb Group, Heavy, as a Second Lieutenant and Bombardier of B-24H #42-52226 during World War II.

On March 6, 1944, B-24H-10-FO Liberator #42-52226 departed from its base at RAF Old Buckenham, England, as part of a large bombing mission targeting industrial facilities at Genshagen, near Berlin, Germany. During the return flight, the formation came under heavy attack from German fighter aircraft and intense anti-aircraft fire. In the course of these engagements, the Liberator was hit and became separated from the protective bomber formation, leaving it more vulnerable to continued enemy attack. After sustaining severe damage, the crew lost control of the aircraft. Unable to maintain altitude or return safely to England, the Liberator crashed into the IJsselmeer, a large inland body of water in the Netherlands, approximately 4 kilometers northeast of Edam. The crash resulted in the deaths of several crew members, while others were able to escape the aircraft and were either rescued or later captured by German forces and taken prisoner.

2Lt Dinneen was killed in action after drowning and is now buried in the Mount Olivet Cemetery, Cheyenne, Laramie County, Wyoming, USA.

Source of information: www.findagrave.com, americanarchive.iwm.org.uk