"Frank" Larkin III (born May 9, 1955) served as the 40th Sergeant at Arms of the United States Senate after his nomination by Senate Majority Leader Mitch McConnell on January 6, 2015, succeeding Andrew B.

[1] Larkin assumed his post as Sergeant at Arms after a distinguished career in both the public and private sector, including work in law enforcement, national security, information technology and cyber security.

[2][3] Larkin previously served in several posts at the United States Department of Defense and law enforcement.

Prior to assuming office, he served in the United States Navy completing Basic Underwater Demolition/SEAL (BUD/S) training class 84 in 1975.

[dubious – discuss][4] Larkin joined the United States Secret Service (USSS) in 1984 as a Special Agent assigned to the Philadelphia Field Office.