US Mil have bases and landing strips. We reached agreement to decrease the number of Marines there to spread them out along the second island chain, better for all of us including Japan. It is a slow process, decades long, but a good choice. Just to relocate a full battallion capability with support to new base, you may need to book about 12 months in advance in peacetime to get the ships and planes and trucks and rail you need in various places to carry that out. We need to be realistic about these things.