In 1940, the 4th army took part in the Louisiana Maneuvers. These maneuvers were orchestrated by General George C. Marshall, and involved many notable figures in the war to come (Eisenhower and Patten namely). These war games which pitted divisions against one another were designed to test the military's mobility and readiness. They lasted into 1941.
In September of 1943, the fourth was sent to Camp Gordon Johnston, FL. There they received amphibious training in preparation for the invasion on Europe already in planning.
In early 1944, the fourth was sent to England to await the beginning of operation Overlord.
Records do not indicate where PFC Nobles was stationed from 1940 to 1943, or what he was doing. His terms of enlistment were for the Philippines department, but no records of his deployment exist.
It is thus likely that PFC Nobles joined the 4th Army right away.
The Carolina Maneuvers had the same goals as those of the Louisiana Maneuvers. The fourth took part in these as well in late 1942.