SAPI price:
Air Force Active Duty or Air Reserve Component personnel or enlisted member without a spouse are eligible. A member is allowed to bring one guest (and one guest only) that is also entitled to the discounted rate. This guest has no restrictions, and could be a civilian, a retiree, or even active duty in another branch of the military.

Deployed Families price:
Allows all Air Force assigned service members returning from deployments or dependent-restricted assignments and their family members to participate in FSS recreational activities. Eligible family members may participate while the member is gone and upon their service member's return. Members who have deployed in support of an active operation and are on a dependent-restricted assignment, and their dependents, are eligible for this initiative. The deployed service member and their family are eligible upon receiving official orders during the deployment and up to 1 year after the service member returns to the home station.
Deployed Affected Personnel is also allowed to bring one guest (and one guest only) that will be entitled to the discounted rate. No restrictions on the type of guest.
Example:
If the spouse wants to bring a guest, and their daughter also wants to bring a friend - only one of those individuals would qualify for the discounted rate. The other would have to pay the full price.