Thank God It's Friday (TGIF) (September 1957)

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   From the NEW YORK TIMES, 8 September 1957, pg. SM13:

      _TGIF_
   Newcomers to Patrick Air Force Base in Florida, where missiles are tested, are usually mystified by seeing the initials TGIF on bulletin boards and notices of various kinds.  They are strictly non-regulation.  They stand for "Thank God It's Friday"--meaning pay-day and week-end relaxation for some in the form of beach parties, club dances, and so on.