In this April 12, 1975 file photo, U.S. Marines provide cover during Operation Eagle Pull as Americans and Cambodians board Marine helicopters in Phnom Penh during the final U.S. pullout of Cambodia. Five days after Operation Eagle Pull, the dramatic evacuation of Americans, the U.S.-backed government fell as communist Khmer Rouge guerrillas stormed into Phnom Penh. Nearly 2 million Cambodians - one in every four - would die from executions, starvation and hideous torture. (AP Photo/File)
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