Jennifer C. Crerar has been promoted to the rank of master sergeant in the U.S. Air Force.
Crerar, a tricare operations and patient administration flight chief is assigned to the 628th Air Base Wing at Charleston Air Force Base, S.C.  The sergeant has served in the military for 15 years.
She is the daughter of Charles Summers of Nighthawk Lane, Summerville, S.C.
The sergeant is a 1993 graduate of Summerville High School.