T.O. iH-3(C)-1, 29 October 1965 with change notices to 1967. About 2" thick with all sections complete. Housed in a vintage black 3-ring binder with the official color-coded stiff dividers. Included in the changes are sections on the M-60 machine gun and there is a 10 page gunners handbook. At the rear of the manual is a "Partial Flight Manual", likely for carrying onboard. Excellent original condition.