John Halachis retired from the U.S. Air Force as a Lieutenant Colonel where his career was divided between flying as a weapons officer/navigator in F4s and in the field of human intelligence gathering assignments. In the span of his career, he was assigned to Germany, Vietnam and Greece on three occasions, mostly in the capacity of Air Attaché. But before all this began, he had a four-year tour in the U.S. Navy where he was assigned to the Joint Military Advisory Group in Greece at the outset of the Marshall Plan.