1) Военный термин: Flexible Deterrent Options, Foreign Disclosure Officer, Fundamental Deterioration Overview, fighter duty officer, fire direction officer, flight duty officer
2) Сокращение: Flexible Deterrent Operations, Flight Deck Officer
3) Вычислительная техника: Functional Device Object
4) NYSE. Family Dealer Stores, Inc.
Универсальный англо-русский словарь. Академик.ру. 2011.