"Super typhoon" Neoguri is headed towards Okinawa and then Tokyo this week. The storm has been called a "once in decades" event, with sustained winds of 150 miles per hour.
The Japan Meteorological Agency said the system, which is already producing winds up to 150 mph, may develop into an "extremely intense" storm by Tuesday as it moves north.
"I can't stress enough how dangerous this typhoon may be when it hits Okinawa," wrote Brigadier General James Hecker on the base's Facebook page on Sunday. "This is not just another typhoon."