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He has a Bachelor of Science degree from the United States Naval Academy, a Masters degree from Oxford University, and is a graduate of the Marine Corps Command and Staff College and the Canadian National Defense College. He received his Ph.D. in modern history from Oxford University.
He served for 30 years in the United States Marine Corps.
Research, writings, and commentaries
Hammes' first paper on fourth-generation warfare appeared in the Marine Corps Gazette in 1994; he developed a book-length treatment while a senior Marine fellow in the Institute for National Security Studies at the National Defense University. In this work, The Sling and The Stone: On War in the 21st Century, he openly criticized The Pentagon and the Joint Chiefs of Staff. Both Hammes and William Lind make use of the term "fourth-generation warfare", however Hammes considers it more of a "framework for study" rather than a revolutionary concept. Hammes traces the origins of fourth-generation warfare to Mao Zedong.
In September 2006, Hammes was one of the retired U.S. military officers who, along with Generals John Batiste and Paul Eaton, called for Secretary of Defense Donald Rumsfeld to resign. They appeared in front of the Senate Democratic Policy Committee to testify, the first prominent U.S. military officials to publicly criticize Rumsfeld. As a result of their remarks, they became widely known, with appearances on national news shows such as on CNN and NPR.
Hammes has also published two articles on strategy in the magazine Infinity Journal, both articles being quoted in, among others, the Marine Corps Gazette and the Huffington Post. The first article, published in November 2010, is "Assumptions - A Fatal Oversight", and the second, published in June 2011, is "Limited means strategy: What to do when the cupboard is bare."
- Forgotten Warriors: The 1st Provisional Marine Brigade, The Corps’ Ethos, and the Korean War. Lawrence, KS: University of Kansas Press, 2010. ISBN 9780700617326
- The Sling and the Stone: On War in the 21st Century. Zenith Press, 2006. ISBN 0760324077
- Colonel T. X. Hammes, USMC, Retired. "The U.S. Army Professional Writing Collection". Army.mil. Retrieved 2014-05-21.
- "Forgotten Warriors". Kansaspress.ku.edu. Retrieved 2014-05-21.
- Institute for National Strategic Studies (INSS). "T.X. Hammes, PhD | Institute for National Strategic Studies (INSS)". Inss.dodlive.mil. Retrieved 2014-05-21.
- Parameters book review
- Hammes, Thomas X. The Sling and The Stone: On Warfare in the 21st Century Zenith Press. 2004. ISBN 0-7603-2059-4.
- "Three Retired Officers Demand Rusmfeld Resignation", Washington Post, 2006
- transcript from Lou Dobbs Tonight 1 November 2006 CNN
- 'The Sling and the Stone': Next-Generation War 18 November 2004 NPR
- Interviews: Marine Col. Thomas X. Hammes 21 June 2005 PBS Frontline "Private Warriors"
- "Assumptions - A Fatal Oversight", infinityjournal.com
- "Limited means strategy: What to do when the cupboard is bare", infinityjournal.com
- Video: "Patriots for Profit: The Rise of the Corporate Warrior" Discussion by Hammes at Hammer Museum, Los Angeles January 12, 2010
- Insurgency Modern Warfare evolves into a fourth Generation
- The Evolution of War: The Fourth Generation Marine Corps Gazette[dead link]
- video nterview (subscription required) at the Pritzker Military Museum & Library