Amami Oshima on the north side of Okinawa Island and Mage Island, which guards the Osumi Strait, are strategically located. The Self-Defense Forces' bases on these two islands have already taken shape, with the intention of forming the northern support point for the entire Southwest Archipelago fortress group. Japanese media revealed that a 2,000-meter runway will be built on Mamo Island, and it is planned that activities such as land take-off and landing training for US aircraft carriers will be carried out here. Construction continues on weekends and nights in order to be completed in March 2030. In addition to the 2 runways, the island also plans to build a mooring facility that can dock large frigates.

Amami Oshima on the north side of Okinawa Island and Mage Island, which guards the Osumi Strait, are strategically located. The Self-Defense Forces' bases on these two islands have already taken shape, with the intention of forming the northern support point for the entire Southwest Archipelago fortress group. Japanese media revealed that a 2,000-meter runway will be built on Mamo Island, and it is planned that activities such as land take-off and landing training for US aircraft carriers will be carried out here. Construction continues on weekends and nights in order to be completed in March 2030. In addition to the 2 runways, the island also plans to build a mooring facility that can dock large frigates.