New Jersey locations figure three times in the fictions. In Flags in the Dust it is the site of the military "embarkation depot" from which Buddy MacCallum takes a ship to France during the First World War (355). There was a real embarkation point in Newark, New Jersey, but the novel isn't that specific.
The fellow soldier who calls Buddy MacCallum "Virge" at the New Jersey port from which they are shipping out for the War. As he had done once before, in Arkansas, Buddy responds by fighting him "steadily and thoroughly and without anger" (355).
The "fellow recruit" who calls Buddy MacCallum "Virge" during their training at a camp in Arkansas; in response Buddy fights him "without anger" for "seven minutes" (355).