Major General Ray Wehnes Barker was a United States Army officer of the Allied Forces, and served in the European Theater of Operations during World War II. Barker was a key member of the combined United States-British group, which became known as COSSAC. This group planned the Battle of Normandy, codenamed "Operation Overlord", also known as D-Day, which liberated Nazi-occupied France. He served as the Deputy Chief of Staff of the European Theater from 1943 to 1944, and Deputy Chief of Staff for Supreme Headquarters Allied Expeditionary Force (SHAEF).