Ramstein Air Base is a US Air Force base located in Germany, and therefore in the Schengen Area
US Military personnel and some civilians can travel there from the US, even on a private basis, provided that the person is eligible, through the Patriot Express DOD program.
Since it is a US Air Force base, it got me curious about how do the, legally required, border controls to be cleared into the Schengen Area work there.
Are the controls operated by German Federal Police officers at arrival on base, like at any German entry point? Or are the controls specially done by specified US or German military personnel?