Hans Halberstadt is a documentary filmmaker and military historian. Born in 1944, at age 18 he served in the U.S. Army as a helicopter door gunner in Vietnam. He returned home to earn a B.A. in Radio/Television/Film from San Francisco State University in 1968, and owned a film studio, Very Moving Pictures, in San Jose, California in the 1970s. Halberstadt is best known for more than 35 non-fiction books, many on special operations, with titles such as Inside the US Navy SEALs (1995), War Stories of the Green Berets: The Vietnam Experience (1994), and Swat Team: Police Special Weapons And Tactics (1994). He has also written on farm and transportation equipment, including Indian Motorcycles… (1996, with Jerry H. Hatfield) and The American Train Depot & Roundhouse (1995, with wife April Halberstadt