Dr David Bullock has a PhD in European Military History. Previously an officer in the US Airforce, he now works as an historian for the Department of Defense and an Associate Professor at Colorado Technical University. He has published one book and over 60 articles on military history, travelling in over 40 countries, including Russia, to do his research. ALEXANDER DERYABIN graduated from Moscow State Historical Archival Institute in 1982 and worked for ten years at the Institute of Military History , Military of Defense. Born in 1961 and a resident of Moscow, he has published numerous books in Russian about the uniforms and history of the Russian Civil War. He contributed substantial material to Osprey’s first two books about the Russian Civil War.