Brian Spencer Eifler (born 30 June 1968) is a United States Army lieutenant general who has served as the deputy chief of staff for personnel of the United States Army (G-1) since August 2024.

On 6 June 2022, USARAK reflagged to 11th Airborne Division as part of the implementation of the Army's arctic strategy.

[5] As part of his professional military education, he went on to graduate from the United States Army Command and General Staff College and received a master of strategic studies degree from the United States Army War College in 2012.

[7][8][9] In May 2024, Eifler was nominated for promotion to lieutenant general and assignment as deputy chief of staff for personnel of the United States Army.

[10][11] Eifler's recent assignments include Commanding General, United States Army Alaska; Chief, Legislative Liaison, Office of the Secretary of the Army; Deputy Commanding General (Operations), 10th Mountain Division and Operation Inherent Resolve[4] [17][18]