VMS Help FORTRAN, Intrinsic Procedures, LLE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

  LLE (character, character)

  A function that returns a value of true if the first character
  string is less than or equal to the second character string.  The
  arguments must be character expressions.  The ASCII collating
  sequence determines the relationship between the arguments.