COL Alicia M. Masson is the Commander of the US Army Environmental Command. She was commissioned through the Reserve Officer Training Corps in May 1999 from the University of Colorado, with a Bachelor of Science Degree in Political Science and minor in Chemistry.

Her previous positions include serving as the Squadron Chemical Officer, Regimental Support Squadron (2d Cavalry Regiment) Platoon Leader in 2000, later the Executive Officer of the 87th Chemical Company, 4th Aviation Squadron 2d Cavalry Regiment). Following, she deployed to Afghanistan and Kuwait in Support of the 18th Airborne Corps and Operation Enduring Freedom.

She was then assigned to the 555th Combat Engineer Brigade (Heavy). In 2005 she Commanded and deployed a mixed Headquarters and Light Engineer Company to Iraq, in support of the 101st Airborne Division (Air Assault) and Operation Iraqi Freedom.

Following Advanced Civil Schooling, she was assigned as the Chief, Officer Training Department, U.S. Army Chemical, Biological, Radiological, and Nuclear School. She then served as the Battalion Executive Officer, 84th CBRN Battalion, and then Brigade S3, 3rd CBRN Brigade. COL Masson was selected as a Department of Defense Fellow with duty at the Defense Threat Reduction Agency in support of the Cooperative Threat Reduction Program, Senate Liaison Office. She was then assigned to the Headquarters, Department of the Army Staff, Army G 3/5/7, Pentagon. Deploying to Afghanistan as the Chief of Staff, Afghan Security Forces Development for the NATO ISAF Joint Command, COL Masson was then assigned to the Joint Staff, J5, as a Strategic Planner. From the Joint Staff, she deployed again to Afghanistan, NATO HQ Resolute Support in support of the Chairman of the Joint Chiefs of Staff-Special Mission. Following Battalion Command at the Radford Army Ammunition Plant, Joint Munitions Command, Army Materiel Command; COL Masson served as a Branch Chief at the U.S. Army Human Resources Command.

COL Masson holds a Master of Strategic Studies, with honors, and Grand Strategy distinction from the U.S. Air War College. She holds a Master of Public Policy and Administration, International Policy concentration, from Baylor University. COL Masson is a 2011 fellow in the National Defense University Program for Emerging Leaders, and a 2017 National Defense University CWMD Fellow. COL Masson is also a graduate of CBRN Basic and Advanced courses, Command and General Staff College, the Defense Nuclear Weapons School and the Defense Language Institute; Dari/Persian.

Awards include: Bronze Star Medal, Defense Meritorious Service Medal (2), Meritorious Service Medal (3), Joint Service Commendation Medal (3), Army Commendation Medal (2), Army Achievement Medal (2), Army Good Conduct Medal (1), NCO Professional Development Medal (2), the National Defense Service Medal (4), Afghanistan Campaign Medal (3), Iraq Campaign Medal, Armed Forces Expeditionary Medal, Humanitarian Service Medal, the NATO Medal (2), the Army Staff Identification Badge and Parachutist Wings.