Radios, Rockets and Radar greatly influenced the life of Lieutenant James. A. Callaghan during his U.S. Government sponsored stay in Viet Nam. The "Conflict", prior to his arrival in country, had spawned what was known to the world as the "Tet Offensive", an extensive and well coordinated action launched by the Viet Cong on the Republic of Viet Nam. During the mayhem caused by the advance of the 13 regular regiments from the north it became obvious that there was a need for a coordinating command to insure the protection of Saigon. This was the birth of the Capital Military Assistance Command, C.M.A.C.. It was hastily setup in an old French Foreign Legion compound and was soon home for the new Radio Officer, Lieutenant James Callaghan. C.M.A.C. highlights his adventures.