Where did American military planners choose to invade in order to stockpile supplies and build up troops for an invasion on japan?

American military planners chose to invade the island of Okinawa as a strategic location to stockpile supplies and build up troops for an invasion of Japan. Okinawa's proximity to the Japanese mainland made it an ideal staging ground for the planned invasion, allowing for easier logistics and support for the Allied forces. The capture of Okinawa, which took place in 1945, provided critical air bases and a launch point for the final assault on Japan.