On the 21st of June, Japanese defences on the southern fringe of Okinawa collapsed. The following day General Mitsuru Ushijima and chief of staff Isamu Chō committed suicide. Colonel Yahara was denied permission to commit suicide and presumably negotiated surrender terms with allied forces:
If you die there will be no one left who knows the truth about the battle of Okinawa. Bear the temporary shame but endure it. This is an order from your army Commander.
Where and when (latitude and longitude if possible) was the surrender signed?