Previously, Paxton was Director, J3 - Operations, The Joint Staff and Chief of Staff, Multinational Forces-Iraq. U.S. Defense Secretary Robert M. Gates announced on 13 March 2008, Paxton's nomination for appointment to the rank of lieutenant general, and for assignment as Director, Strategic Plans & Policy, J-5, The Joint Staff. On 22 May 2007, Paxton relinquished command of the 1st Marine Division to take the role of Chief of Staff for Multi-National Force-Iraq.[4]
In addition to The Basic School, Paxton's professional education includes United States Marine Corps Amphibious Warfare School (non-resident), United States Army Infantry Officer Advanced Course, and the United States Marine Corps Command and Staff College. From 1994 to 1995 Paxton was a Federal Executive Fellow in Foreign Policy Studies at the Brookings Institution. He has also been a Marine Corps Fellow at Massachusetts Institute of Technology's Seminar XXI.
In addition to command, Paxton also served in Operations, Plans and Training (G3/S3) at the battalion, regiment, division (1st and 2nd Marine Divisions) and Marine Expeditionary Force (II-MEF) levels. Non-Fleet Marine Force tours included Commanding Officer Company B, Marine Barracks, 8th & I, Washington, D.C. (1980–81); Commanding Officer Marine Corps Recruiting Station New York, New York (1985–88); Strategic Plans Branch (PLS), Plans, Policies and Operations (PP&O) Department, Headquarters United States Marine Corps; and as Executive Assistant and Marine Corps Aide to the Under Secretary of the Navy (1996–97). Paxton is a Joint Service Officer, having served at United Nations Command/Combined Forces Command in South Korea from 1989 to 1991 as Amphibious Operations Officer and Executive Officer, Crisis Action Team.
From June 1997 to June 1998, Paxton was the Assistant Chief of Staff G3 (Operations, Plans and Training). His next assignment, from June 1998 to June 2000, was commanding officer of 1st Marine Regiment.[5] From 2000 to 2001, Paxton had a one-year tour as the United States Marine Corps Fellow (National Security Studies) at the Council on Foreign Relations in New York. From July 2001 to August 2003, he was the Director, Programs Division (RP), and Assistant Deputy Commandant of the Marine Corps for Programs and Resources (ADC,P&R), Headquarters Marine Corps.
From 2003 to 2006, Paxton served as Commanding General, Marine Corps Recruit Depot San Diego and Western Recruiting Region. On 22 May 2007, Paxton relinquished command of the 1st Marine Division to Brigadier General Richard P. Mills.[6] Paxton next served as the Chief of Staff to the commander of Multi-National Force - Iraq. Advanced to lieutenant general in 2008, Paxton served initially as Director, Strategic Plans and Policy (J-5) on the Joint Staff, then was nominated and confirmed to the Operations Directorate (J-3), where he served until appointment as CG, II MEF; and CG, Marine Forces, Africa. Before departing the Pentagon, Paxton also served as interim director, The Joint Staff.
Paxton retired in August 2016.[2] Paxton is an Advisory Board Member of Spirit of America, a 501(c)(3) organization that supports the safety and success of US troops serving abroad.[7]