Aircraft
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      United States
      Military since 1962
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      Basic Classifications: In 1962, the U.S. Air
      Force and U.S. Navy designations were unified into a single system as then
      Secretary of Defense Robert McNamara decided to simplify the procurement
      of military aircraft.  The unification was achieved by re-designating
      existing Navy aircraft to conform to the existing Air Force system with
      the exception of resurrecting the "A" for Attack
      designation.  The specific model number within the mission
      designation (for example, the "101" in "F-101") was
      restarted at one as the model numbers of fighter and cargo aircraft were
      well into the hundreds in 1962.
      Prefixes: Modification to the basic mission of an
      aircraft continued to be noted by a mission prefix.  For example the
      RF-4 Phantom was a reconnaissance version of the F-4 Phantom fighter
      aircraft.