The Free On-line Dictionary of Computing (30 December 2018):

MITRE Corporation

    A US federally funded R&D center, spun off in 1958 from
   the MIT Lincoln Laboratory (also an FFRDC).  MITRE is a
   non-profit corporation chartered to do R&D in the public
   interest.

   MITRE were responsible for system engineering and
   implementation oversight of SAGE.

   MITRE does not stand for MIT Research and Engineering, though
   it could have.

   (http://mitre.org/).

   (1999-12-16)