Complete the following sentence: With the fall of both Cambodia and South Vietnam in April 1975, the political climate between Washington and the government of PM Sanya had soured. <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk> <unk>
️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ Thai government wanted the U.S. out of Thailand by the end of the year.<unk> Thai government wanted the U.S. out of Thailand by the end of the year. Air Force implemented Palace Lightning, the plan to withdraw its aircraft and personnel from Thailand.<unk> Air Force implemented Palace Lightning, the plan to withdraw its aircraft and personnel from Thailand. The SAC units left in December 1975; and the 3rd Aerospace Rescue and Recovery Group left on 31 January 1976, however the base remained under US control until it was formally returned to the Thai government on 13 June 1976.