The Air Force Security Service (USAFSS or AFSS) was activated as a major command* on October 20, 1948, charged with cryptologic and communications security (COMSEC) missions for the newly-created Department of the Air Force. In January, 1964, USAFSS adopted the motto "Freedom Through Vigilance," which was coined by Lt Mike Egan. USAFSS (as well as its successor organizations) was the Air Force component of the Central Security Service (CSS), a companion organization to the National Security Agency (NSA).
The USAFSS emblem is divided into four quadrants. The globe symbolized worldwide influence; the lightning bolt symbolized radio transmissions; the wing symbolized the Air Force itself; and the sword symbolized protection and security. The emblem was designed by Airman Second Class (A2C) William "Bill" Rogers of Miami, Florida. His design was selected from a command-wide contest of entries. The "Freedom through Vigilance" motto was authored by Lt Mike Egan, a former USAFSS member (duty assignment unknown).