1. August 1989 - January 1990, Duty Officer, 510th Strategic Missile Squadron, Whiteman AFB, Mo.
2. February 1990 - June 1990, Student, Undergraduate Missileer Training, Top Performer, Vandenberg AFB, Calif.
3. June 1990 - July 1994, ICBM Combat Crew Officer, Senior Instructor, Senior Evaluator, Training and Evaluation Flight Commander, 351st Missile Wing, Whiteman AFB, Mo.
4. July 1994 - August 1994, Student, Space Operations Bridge Course, Vandenberg AFB, Calif.
5. August 1994 - December 1996, Satellite Operations Flight Commander and Chief of Operations Training, 6th Space Operations Squadron, 50th Space Wing, Offutt AFB, Neb.
6. January 1997 - March 2000, ICBM/SLBM Force Employment Officer and Chief, Ballistic Missile Tactics, Combat Plans Division, Plans and Programs Directorate, United States Strategic Command, Offutt AFB, Neb.
7. April 2000 - July 2002, Chief, Strategy and Concepts Planning Branch and Chief, Space Arms Control Policy, Deputy Chief of Staff, Air and Space Operations, Headquarters, United States Air Force, Pentagon, Washington D.C..
8. August 2002 - June 2003, Student, Top Third graduate, Air Command and Staff College, Maxwell AFB, Ala.
9. July 2003 - June 2004, Chief, Space and Missile Standardization/Evaluation Policy, Directorate of Air and Space Operations, Headquarters, Air Force Space Command, Peterson AFB, Colo.
10. June 2004 - July 2005, Deputy Director, Commander's Action Group, HQ, Air Force Space Command, Peterson AFB, Colo.
11. July 2005 - July 2006, National Defense Fellow (Senior Developmental Education), Center for Strategic and International Studies, International Security Program, Washington, D.C.
12. July 2006 - June 2008, Commander, 595th Operations Support Squadron, 595th Space Group, Space Innovation and Development Center, Schriever AFB, Colo.
13. June 2008 - July 2011, Chief, Nuclear Operations and Integration Division, Asst Chief of Staff for Strategic Deterrence and Nuclear Integration, Headquarters, United States Air Force, Pentagon, Washington D.C. From January - December 2009, temporarily assigned as the Chief of Staff, Air Force Global Strike Command (Provisional) and as Special Assistant to the Commander, AFGSC, for ICBM transfer from AFSPC to AFGSC.
14. July 2011 - July 2013, Vice Commander, 90th Missile Wing, F. E. Warren AFB, Wyo.
15. July 2013 - June 2014, Director, Task Force 214, F. E. Warren AFB, Wyo.
16. June 2014 – June 2020, Vice Commander, Air Force Nuclear Weapons Center, Kirtland AFB, N.M.
17. June 2020 – August 2021, Chief Nuclear Inspections and Education Department; Commandant, Defense Nuclear Weapons School and Chief Nuclear Inspector, Defense Threat Reduction Agency, Kirtland AFB, New Mexico
18. August 2021 – September 2022, Chief Defense Nuclear Inspections Oversight Department, Defense Threat Reduction Agency, Kirtland AFB, New Mexico
19. September 2022 – February 2023, Consultant, Louisiana Technical Research Institute, Louisiana Tech University, Bossier City, LA and Adjunct Contract Professor, Flatter Inc, Fredericksburg, VA.
20. February 2023 – present, Associate Dean, School of Strategic Force Studies, Air Force Institute of Technology, Wright-Patterson AFB, Ohio.