Bull crap!
It is BS because the Chaplain can go off Base and marry anyone if it is allowed in that state. No Chaplain has a “chapel.” The Chapels are non-denominational. You may have a Chapel designated for Catholic Services, but on many bases the same Chapel will be used by other denominations. As I told my Chaplain, I will never attend services in any Base Chapel as long as the Chief of Chaplains (gay friendly denomination) allows base Chapels to be defiled.