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[STDS-802-16] Clarification on the CRC in the MAC PDU

Could someone please clarify an ambiguity I am seeing regarding the MAC PDU
and the CRC?  When present, is the CRC considered part of the MAC PDU or is
it like and appendix?

Here are the sections in P802.16-REVd/D3, that suggest on or the other
interpretation:
--Section 6.4.2, page 53, line 15, "A MAC PDU may contain a CRC, as
described in 6.4.3.5.".
--Page 54, Table 5, Row 1: CI Description: "1 = CRC is appended to the PDU."
--Section 6.4.3.5 CRC calculation: "A service flow may require that a CRC be
appended to each MAC PDU carrying data for that service flow (11.13.14). In
this case, a CRC, as defined in IEEE 802.3, shall be included in each MAC
PDU..."

The reason for differentiating is because the LEN field in the MAC header
(Table 5) is "The length in bytes of the MAC PDU including the MAC header."

So I guess the real question is, does the LEN field include the length of
the CRC when present?

Thanks for your help.

Jon