Mark A. Berhow has long had an interest in the history of American missile defense systems, and is the co-author of Rings of Supersonic Steel: Air Defenses of the United States Army 1950–1979. He was worked at the Fort MacArthur Museum and the Nike missile post in Los Angeles for over 10 years, and is a past chairman of the Coast Defense Study Group (CDSG), an organization dedicated to the study of seacoast fortifications in the United States and around the world. He has written and co-written numerous books, including Fortress 4: American Defenses of Corregidor and Manila Bay 1898–1945. Mark lives in Peoria, Illinois. Chris Taylor was born in Newcastle, UK, but now lives in London. After attending art college, he graduated in 1995 from Bournemouth University with a degree in computer graphics. Since then, he has worked in the graphics industry and is currently a freelance illustrator. He lives in Sussex, UK.