WWII 37-MM Gun, Tank M5 War Department Field Manual. Softbound. Small size. Titled RESTRICTED FM-23-80 WAR DEPARTMENT BASIC Fi137 pages. Also has the insert still inside the cover. Shows storage wear and looks like it might have been folded at one time. Still hard to find.ELD MANUAL 37-MM GUN, TANK, M5 (MOUNTED IN TANKS) MAY 9, 1942.