/VFC_HEADER={ IGNORE | DATA | KEEP }

   Specifies how to handle files in variable-with-fixed-control-area
   format (such as batch .log files).  By default, the control area is
   ignored.  /VFC_HEADER=DATA causes the control area, which is normally
   hidden, to be treated as part of the normal record contents.  A value
   of KEEP causes the output file to have the same format as the input
   file (rather, as the *first* input file if there is more than one).
   If the [first] input file is not in VFC format, /VFC_HEADER=KEEP has
   no effect.