CMSgt Mark A. Diehl is Command Chief Master Sergeant at 423d Wing and 423d Air Expeditionary Wing, Creech Air Force Base, Nevada. He is the principal advisor to the Wing Commander on operational matters and issues affecting the health, morale, welfare, readiness, and effective utilization of more than 5,000 active duty and government civilians in five groups. Additionally, the 432d Wing consists of 21 squadrons, including three geographically separated squadrons at locations across the United States, training pilots, sensor operators, intelligence professionals and other crew members to conduct persistent attack and reconnaissance combat operations worldwide. The 423d Air Expeditionary Wing conducts MQ-9 and RQ-170 deployed operations in support of Combatant Commands across the globe.
Chief Diehl enlisted in the Air Force in July 2001 and completed security forces technical training in December of that same year. He has held a variety of positions within the security forces career field. Additionally, he served in the First Sergeant developmental special duty career field. He has also deployed in support of Operations ENDURING FREEDOM, IRAQI FREEDOM, and INHERENT RESOLVE. Prior to this assignment, he served as the Security Forces Functional Assignment Manager, Headquarters Air Force Personnel Center, Joint Base San Antonio-Randolph, Texas.
EDUCATION
2005 Airman Leadership School, Kadena Air Base, Japan
2009 Senior Enlisted Joint Professional Military Education I, by distance learning
2010 Associate of Applied Science, Criminal Justice, Community College of the Air Force
2011 USAF Noncommissioned Officer Academy, Kadena AB, Japan
2012 USAF Senior Noncommissioned Officer Academy, Version 5, by distance learning
2012 USAF First Sergeant Academy, Maxwell Air Force Base-Gunter Annex, Ala.
2012 Professional Manager Certification, Community College of the Air Force
2013 Associate of Applied Science, Human Resources Management, Community College of the Air Force
2014 Bachelor of Arts, Criminal Justice, American Military University, Charles Town, W.Va.
2014 USAF Senior Noncommissioned Officer Academy, Version 6, by distance learning
2015 USCG Chief Petty Officer Academy, Coast Guard Training Center Petaluma, Petaluma, Calif.
2016 Senior Enlisted Joint Professional Military Education II, National Defense University, by distance learning
2016 Master of Arts, Human Resources Management; Leadership and Management, Webster University, St. Louis, Mo.
2019 USAF Chief Leadership Course, Maxwell AFB-Gunter Annex, Ala.
2025 Wing Command Team Training Course, Maxwell-Gunter, Ala.
ASSIGNMENTS
1. July 2001 – September 2001, Trainee, Basic Military Training, Lackland AFB, Texas
2. September 2001 – January 2002, Student, Security Forces Apprentice Academy, Lackland AFB, Texas
3. February 2002 – February 2004, Installation Entry Controller; Security Forces Controller, 423rd Air Base Squadron, Royal Air Force Alconbury, United Kingdom
4. March 2004 – March 2005, Military Customs Inspector, 51st Security Forces Squadron, Osan AB, Republic of Korea
5. April 2005 – July 2007, Desk Sergeant; Unit Training Manager; Program Manager, Evaluations and Decorations, 18th Security Forces Squadron, Kadena AB, Japan (February 2006 – August 2006, Desk Sergeant, Law and Order Detachment, 332d Expeditionary Security Forces Squadron, Balad AB, Iraq)
6. September 2007 – September 2008, Town Patrolman, 51st Security Forces Squadron, Osan AB, Republic of Korea
7. October 2008 – July 2011, Assistant Flight Chief; NCOIC, Security Forces Training, 374th Security Forces Squadron, Yokota AB, Japan (September 2009 – March 2010, Flight Chief; NCOIC, Reports and Analysis, Provost Marshal Office, 755th Air Expeditionary Squadron, Kandahar Airfield, Afghanistan)
8. July 2011 – September 2012, NCOIC, Integrated Defense, 23d Security Forces Squadron, Moody AFB, Ga.
9. September 2012 – January 2014, First Sergeant, 23d Comptroller Squadron and Wing Staff Agencies, Moody AFB, Ga.
10. January 2014 – December 2015, First Sergeant, 23d Equipment Maintenance Squadron, Moody AFB, Ga.
11. January 2016 – January 2017, First Sergeant, 51st Aircraft Maintenance Squadron, Osan AB, Republic of Korea
12. February 2017 – January 2019, Superintendent, Logistics, 35th Security Forces Squadron, Misawa AB, Japan
13. January 2019 – January 2020, Security Forces Manager, 23d Security Forces Squadron, Moody AFB, Ga.
14. January 2020 – July 2022, Senior Enlisted Leader, 374th Security Forces Squadron, Yokota AB, Japan (April 2021 – October 2021, Senior Enlisted Leader, 332d Expeditionary Security Forces Squadron, Undisclosed Location, Southwest Asia)
15. July 2022 – January 2024, Security Forces Manager, Force Protection Directorate, Headquarters Ninth Air Force (Air Forces Central), Shaw AFB, S.C.
16. January 2024 – June 2025, Security Forces Functional Assignment Manager, Headquarters Air Force Personnel Center, Joint Base San Antonio-Randolph
17. June 2025 – Present, Command Chief Master Sergeant, 432d Wing / 423d Air Expeditionary Wing, Creech AFB, Nev.
MAJOR AWARDS AND DECORATIONS
Defense Meritorious Service Medal
Meritorious Service Medal with nine oak leaf clusters
Air and Space Commendation Medal
Army Commendation Medal
Air Force and Space Achievement Medal with one leaf cluster
OTHER ACHIEVEMENTS
2010 Pacific Air Forces Junior Enlisted Lance P. Sijan Award
2010 Pacific Air Forces Security Forces Staff Level Noncommissioned Officer of the Year
2010 5th Air Force Noncommissioned Officer of the Year
2011 Distinguished Graduate, Noncommissioned Officer Academy
2013 23d Wing Arthur Flemming Leadership Award
2014 Air Combat Command First Sergeant of the Year
2016 51st Fighter Wing First Sergeant of the Year
EFFECTIVE DATES OF PROMOTION
Airman Basic, July 24, 2001
Airman First Class, Sept. 24, 2001
Senior Airman, Jan. 24, 2004
Staff Sergeant, Aug. 1, 2005
Technical Sergeant, July 1, 2009
Master Sergeant, July 1, 2012
Senior Master Sergeant, March 1, 2016
Chief Master Sergeant, Dec. 1, 2018
(Current as of June 2025)