David Bullock holds a PhD in European Military History and has been an officer in the U.S. Air Force. Currently, he writes official histories as a military historian for the Department of Defence and is an adjunct Associate Professor at Colorado Technical University, Colorado Springs. He is the author of New Vanguard 83 Armoured Units of the Russian Civil War: White and Allied and New Vanguard 95: Armoured Units of the Russian Civil War: Red Army