This vintage U.S. Army Field Book, FM 21-20, is a must-have for any military history enthusiast or collector of militaria. Published in 1985, it is an original piece from the Cold War era, providing a unique insight into physical fitness training during that time. The book includes detailed exercises and training programs used by the U.S. Army, making it a great resource for anyone interested in military fitness. With its authentic content and originality, this book is a valuable addition to any collection of militaria. The book is in good condition and has not been modified. It is a rare find for collectors and history enthusiasts alike.