I know they do offer the discount, but I believe there are some blackout times, better check with a good cruise travel agent, or give Carnival a call. I would think, depending on the cruise, the value of the discount is different.
The discount definately varies by date and ship. The most we have ever received is $200pp and the quote I received about 2 weeks for the Valor Dec 30 07 had a $50pp discount. The military discount can be added or withdrawn at any time, so if the sailing you are interested in doesn't have one at this time keep checking back to see if they are offering one. On the same token if they offer a good military discount...grab it while you can!
Carnival cruise # 11 April 22, 2007 Victory
#12 December 30 2008 Valor for Niece's wedding
in St Thomas!