Sentinel Federal Credit Union

Sentinel started out as Ellsworth Air Force Base Federal Credit Union in 1955 and proudly served the US Air Force military personnel on Ellsworth AFB in South Dakota. Today, Sentinel Federal Credit Union has more than 10,000 members, seven branch locations, and more than $155 million in assets. Membership is open to anyone who lives, works, worships, attends school or has a business or other legal entity in Pennington, Lawrence, Meade, Custer, Lyman, Todd, Tripp, Gregory, and Mellette counties in South Dakota.