Airman Second Class Thaddeus M. Janiak distinguished himself by outstanding achievement as an Air Policeman, Law Enforcement Section, 377th APS, Tan Son Nhut Air Base, Republic of Vietnam on 4 December 1966.  On that date, Airman Janiak valiantly fought against a force of Viet Cong attackers attempting to penetrate the base perimeter defenses.  Although faced by a numerically superior force, Airman Janiak held his position throughout the ensuing firefight, which resulted in the attacking force being repulsed. This courageous stand against superior odds closed the entry/exit point of the Viet Cong, preventing further entrance by the hostile force and trapping those already on base.  The distinctive accomplishments of Airman Janiak reflect credit upon himself and the United States Air Force.