There isn't a central online reservation system for military campgrounds. If the military campground accepts reservations (not all do), you'll need to call them for reservations. Some also accept a fax or email. Some also require payment in advance, some require just a deposit, and some just want your name. A couple only accept reservations by completing their form online, or by mailing it in.

Special reservation requirements are included on thee campground's information page. Contact information is also listed on each campground's information page.