Hans Halberstadt Hans Halberstadt studied documentary film in college and later took up writing, authoring or co-authoring more than fifty books. Most of his books have been on military subjects, especially U.S. special operations forces, armor,and artillery. He has also written extensively about farming and railroads. Halberstadt served in the U.S. Army as a helicopter door gunner in Vietnam. He and his wife, April, live in San Jose, California. Read More Read Less