A graduate of the U.S. Naval Academy and a career Marine, Thomas X. Hammes has spent most of his twenty-nine years on active duty serving in infantry and intelligence assignments. One of the first authors to define fourth generation warfare, Colonel Hammes has written numerous articles for defense journals and lectured at war and staff colleges. His writing has also appeared on the opinion page of The Washington Post. Hammes lives with his family in Northern, VirginiaHammes, Thomas is the author of 'Sling and the Stone On War in the 21st Century', published 2004 under ISBN 9780760320594 and ISBN 0760320594.