On January 12, 1944, the 296th Infantry Regiment departed from Puerto Rico to the Panama Canal Zone. In April 1945, the unit returned to Puerto Rico and soon after was sent to Honolulu, Hawaii. The 296th arrived on June 25, 1945 and was attached to the Central Pacific Base Command at Kahuku Air Base. Lieutenant Colonel Gilberto José Marxuach, "The Father of the San Juan Civil Defense", was the commander of both the 1114th Artillery Co. and the 1558th Engineers Co.