 The 65th Infantry faced the German 34th Infantry Divisions 107th Infantry Regiment and participated in a number of small unit engagements at Turine, Espinal-Chenimeril and Leintray.Cordero-Dávila served with the regiment in World War II for over three and a half years, advancing from the Regimental S-4 to Battalion Executive Officer, Battalion Commander of the regiment's 3rd Battalion, and Regimental Executive Officer.He also served for short periods during World War II as the Regimental Commander.