CSM Brennan was born in Leominster, Massachusetts and enlisted into the Army in September 1994 as a 
Combat Engineer. He attended basic training and advanced individual training at Fort Leonard Wood, 
Missouri.

CSM Brennan assumed his position as the United States Army Engineer School Command Sergeant Major 
in July 2020. His stateside assignments include the 307th Engineer Battalion, 82nd Airborne 
Division (Fort Bragg, NC), 37th Engineer Battalion, 20th Engineer Brigade (Fort Bragg, NC), Uni- 
versity of South Florida, 6th Brigade ROTC (Tampa, FL), USASMA, Sergeants Major Course (Fort Bliss, 
TX), and the 20ᵗʰ Engineer Brigade (Fort Bragg, NC).

His overseas assignments include the 16th Engineer Battalion (Bamberg, Germany), 1/ 508th Airborne 
Battalion Combat Team (Vicenza, Italy), 54th Engineer Battalion (Bamberg, Germany),
Operations Group, Joint Multinational Readiness Center (Hohenfels, Germany), 9th Engineer 
Battalion, 172nd Infantry Brigade (Schweinfurt, Germany),
and the Regimental Engineer Squadron, 2nd Cavalry Regiment (Vilseck, Germany). CSM Brennan has de- 
ployed in support of Operation Joint Endeavor (Bosnia), Operation Joint Guardian (Kosovo), 
Operation Iraqi Freedom, Operation Enduring Freedom, and Operation Spartan Shield for peacekeeping 
and combat opera- tions.

CSM Brennan's awards and decorations include the Legion of Merit (2), Bronze Star Medal (3), 
Meritorious Service Medal (5), Army Commendation Medal (4), Army Achievement Medal (7), Army Good 
Conduct Medal (8), National Defense Service Medal (Bronze SS), Armed Forces Expeditionary Medal, 
Kosovo Campaign Medal (Bronze SS), Afghanistan Campaign Medal (3 Bronze CS), Iraq Campaign Medal (2 
Bronze CS), Global War on Terrorism Expeditionary Medal, Global War on Terrorism Service Medal, 
Armed Forces Ser- vice Medal, Military Outstanding Volunteer Service Medal, NCO Professional 
Development Ribbon(4), Army Service Ribbon, Overseas Service Ribbon (6), NATO Medal (3 Bronze SS), 
Presidential Unit Citation, Valorous Unit Citation, Meritorious Unit Commendation, Army Superior 
Unit Award, Master Parachutist Badge, Russian Parachutist Badge, Egyptian Parachutist Badge, Combat 
Action Badge, and recipient of the BronzeOrder of the de Fleury Medal and the Order of Saint 
Maurice-Legionnaire.

CSM Brennan's military education includes the Primary Leadership Development Course, Basic 
Noncommissioned Officer Course, Advanced Noncommissioned Officer Course, Basic Airborne School, 
Jumpmaster Course, Army Combative Course Tier I, Route Clearance and Reconnaissance Leaders Course, 
School of Cadet Command Instructor Training Course, Cadet Command Pre-command Course, Master 
Resilience Trainer Course, Sergeants Major Course (CL65), Battalion/Brigade Pre-command Courses, 
Command Sergeants Major Developmental Program, Nominative Leaders Course, and the Force Integration 
Course for Senior Leaders.

CSM Brennan earned an Associate's in Administrative Management and Bachelor’s in Business 
Management from Excelsior College.

CSM Brennan is married to the former Ute Hornung and they have three daughters Kaylee, Brianna, and 
Keara.