File Profile and name version declaration, followed by numercial complexity level (2 bytes), followed by 4 resereved bytes, followed by originating station id, followed by 14 byte file date and time sequence in form DDHHMMSSz(MON)YY, followed by 72 byte length file title alphanumeric sequence with 8 additional space bytes,to 1 byte file security classification declaration (T|S|C|R|U)