Originally Posted by FlyWithoutWings
The online booking code is MMF (if you're curious to see what the Friends & Family rates are), but remember that the rate will be declined if the internal paperwork isn't provided to the hotel.
A similar online booking code is
MMP, Marriott Associate Pleasure Rate. This rate is only for associates, spouse, parents and children only travelling for pleasure. ID is required. Associate authorization forms are available in property's HR department.