Opening Gate 4 at Kadena easing traffic, adding convenience Published June 25, 2010 By Armed Forces Network - Okinawa KADENA AIR BASE, Japan -- Kadena Air Base has a population of more than 20,000 servicemembers and civilians. Obviously, this can cause heavy traffic at the gates. Marine Lance Cpl. Nate Carberry explains how the opening of one of the previously-closed gates is making trips to and from Kadena more convenient.