Lieutenant General Brian Eifler became the Headquarters Department of the Army Deputy Chief of Staff, G-1 on 5 August 2024. He previously served as the Commanding General of the 11th Airborne Division, Army Chief Legislative Liaison, Deputy Commanding General of the 10th Mountain Division (light), and the Director, CJ3 for Combined Joint Task Force - Operation Inherent Resolve in Iraq.

A native of Michigan, LTG Eifler graduated and received his commission as an Infantry Officer from Central Michigan University. While at Central Michigan, he also graduated from Airborne and Ranger school.

He has served in command and leadership positions in: the 1st Battalion, 125th Infantry Michigan National Guard, the 82nd Airborne Division, 1st Ranger Battalion, 75th Ranger Regiment, 2nd Infantry Division, 3rd Ranger Battalion, 75th Ranger Regiment, III Corps, 4th Infantry Division, 1st Armored Division, 75th Ranger Regiment Special Troops Battalion, 25th Infantry Division, 10th Mountain Division and HQDA staff. LTG Eifler Commanded the 1st Battalion, 6th Infantry in Germany, the 75th Ranger Regiment Special Troops Battalion at Fort Benning, and the 3rd Brigade Combat Team 25th Infantry Division in Schofield Barracks, HI.
His operational deployments include OPERATION UPHOLD DEMOCRACY, Haiti; OPERATION IRAQI FREEDOM, Iraq; OPERATION ENDURING FREEDOM, Afghanistan; OPERATION INHERENT RESOLVE, Iraq.

LTG Eifler’s education includes bachelor’s degree in Interpersonal and Public Communication from Central Michigan University and a Masters in Strategic Studies from the United States Army War College. He is also a graduate of the MIT Seminar XXI National Securities Studies Program.

LTG Eifler's awards and decorations include two Defense Superior Service Medals, four Legions of Merit, three Bronze Star Medals, seven Meritorious Service Medals, Army Commendation Medal for Valor, four Army Commendations, three Army Achievement Medals, Humanitarian Assistance Medal, and the Outstanding Volunteer Service Medal. He is authorized to wear the Combat Infantryman Badge, the Expert Infantryman Badge, Master Parachutist Badge, Pathfinder Badge, Ranger Tab, and the Army Staff Identification Badge. He is also a top-ten finisher at the Army’s Best Ranger Competition.