He was awarded the American Distinguished Service Cross and the French Croix de Guerre for gallantry in action 1–2 November 1918, shortly before the armistice with Germany which ended the war.

The citation for his DSC reads: The President of the United States of America, authorized by Act of Congress, July 9, 1918, takes pleasure in presenting the Distinguished Service Cross to Captain (Infantry) Ray E. Porter, United States Army, for extraordinary heroism in action while serving with 34th Infantry Regiment, 7th Division, A.E.F., near Rembercourt, France, November 1–2, 1918.

Captain Porter led his company in a successful assault on a ridge of high ground, taking several strong points and machine-gun nests and numerous prisoners.

[1]Remaining in the army during the interwar period, Porter graduated from the Company Officers Course (1928) and the Advanced Course (1932) of the Infantry School, Fort Benning, Georgia; The Command and General Staff School (1935), Fort Leavenworth, Kansas and the Army War College (1937), Washington, D.C. Other service of that period included duty as Professor of Military Science and Tactics, Ouachita Baptist College, Arkadelphia, Arkansas; (1922–1927) a tour of foreign service with the 19th Infantry in Hawaii, (1928–1931) and instructor at the Command and General Staff School, Fort Leavenworth, Kansas, 1937-1940.

In World War II he took part in the assault landing of the Allied Forces at Algiers, North Africa in November 1942 and served as Deputy Chief of Staff at General Eisenhower's Advance Headquarters during the Tunisian campaign.