Students navigate an obstacle course while shouldering what appear to be sandbags in this photo archivists date to between 1941 and 1945. During World War II, Princeton set up a physical-training program that stressed conditioning for war service, but a lack of undergraduates on campus — at the lowest point during the war, the number of civilian students fell below 400 despite a plea from President Dodds to stay in school rather than sign up for military service — stretched the University’s finances to the breaking point. To stay viable, the University opened its doors to the military, establishing the Naval Training School (or V-12). Can any PAW readers identify these physically fit men?