Waddell became an Engineer Officer with
15th Engineer Battalion, then the
9th Infantry Division as a Platoon Leader and Battalion Maintenance Officer. With
Joint Task Force Bravo at
Soto Cano (Palmerola) Air Base,
Comayagua,
Honduras, he served as the JTF Engineer. In the 35th Engineer Battalion, he served as the Commander C Company. He returned to the United States Military Academy as an instructor in the Department of Social Sciences. He subsequently served as Director for European Security Affairs on the
National Security Council. Waddell has been an Active Reserve officer, filling the following roles: • Special Assistant at the Office of the
Deputy Under Secretary of the Army; • Deputy Commander for Mobilization and Reserve Affairs,
United States Southern Command,
Florida • Energy Sector Strategic Analyst,
United States Central Command • Special Advisor,
101st Airborne Division (Air Assault),
Tikrit, Iraq • Joint Strategic Planner, Headquarters
Multi-National Force – Iraq; • Director of Oil, J9,
United States Forces – Iraq • J4 (operational support – wartime),
United States Forces Korea • Director,
Combined Joint Interagency Task Force – Shafafiyat ("transparency"),
NATO International Security Assistance Force,
Kabul, Afghanistan (following
H. R. McMaster) • Commander,
76th Operational Response Command,
Salt Lake City, Utah (
Major General; assumed command, 17 October 2015) A special retirement review was held for Waddell at Conmy Hall,
Joint Base Myer-Henderson Hall on 13 August 2021. He is set to vacate his role as assistant to the
Chairman of the Joint Chiefs of Staff at the end of September 2021, with his retirement effective on 1 October 2021. ==Civilian career==