U.S. Naval Training Station, Great Lakes, Illinois.
Factory serviceman John W. Power and assistant Ben White instructing class of Army personnel at Camp Normoyle, TX.
US Army Signal Corpsmen being trained to use radio apparatus. Ft Devon, MA. 1941.
US marines on 50-mile walk as they take up a challenge issued in an old (1908) executive order by the late Pres. Teddy Roosevelt that required all Marine Corp. officers to walk 50 miles in 20 hrs. w/o stopping, Great Lakes Naval Training Center, 1963.
West Point cadets training, August 1942
(via http://demons.tumblr.com)
West Point cadets training, August 1942 
(via http://demons.tumblr.com)
West Point cadets training, August 1942.
(via: http://demons.tumblr.com)
Opaque  by  andbamnan