The U.S. military presence on Okinawa, which began during World War Two, includes most of the 18,000 U.S. marines stationed in Japan.
MARINE LITTORAL REGIMENTSThe U.S. Marine Corps is creating 'Marine Littoral Regiments' of around 2,000 troops as part of restructuring plan proposed by the Marine Commandant General David Berger in 2020.
Dispersing marine units across Okinawa, even if only temporarily, could see U.S. troops return to islands along the chain for the first time since Washington returned Okinawa to Japanese control in 1972.
JAPAN'S OKINAWA PIVOTTo reinforce Okinawa, Japan is building new anti-ship and air defence missile bases, and radar stations, including one on Yonaguni, it hopes will deter Chinese forces from attacking.
Those weapons, along with anti-ship missiles fielded in Okinawa by the new littoral regiments, could help close a growing missile gap with China, say experts.