This comes directly from the Disney website:
Through December 23, 2009, each active or retired member of the U.S. military may obtain one complimentary 5-day “Disney’s Armed Forces Salute” ticket with Park Hopper® and Water Park Fun & More options. This ticket is valid for five days of admission into the four Walt Disney World® theme parks, plus a total of five visits to a choice of a Disney water park, DisneyQuest® Indoor Interactive Theme Park or certain other attractions. During this offer period, active or retired U.S. military personnel (or their spouses, but not both) may also make a one-time purchase of up to a maximum of five 5-Day “Disney’s Armed Forces Salute Companion” tickets (one theme park per day) for $99 per ticket, plus tax, for family members (including spouse) or friends. Although this ticket for family members and friends does not include either the Park Hopper® or Water Park Fun & More options, this ticket can be upgraded to add either such option, or both, for an additional $25, plus tax, per option. Actual prices may be less. All tickets and options are non-transferable and must be used by December 23, 2009.
Eligible members of the military can also save 40% on rooms at select Disney Resorts.
For more information, rules and restrictions click here.