off-duty adj. Not performing or available for duties at the given moment; as, an off-duty policeman. Opposite of on-duty, working, and on-the-job. (prenominal)
... fatigues of twenty or thirty men per company went back to meet the battalion transport wagons at some point several miles in rear of the firing-line. There were trench supplies and stores to be brought up as well, and the never-finished business of mending and improving the trenches kept many off-duty men employed during ... — Kitchener's Mob - Adventures of an American in the British Army • James Norman Hall