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(Original Caption) Queues form outside the American Embassy in the hope of securing visas available to wives, Vietnamese mothers married to Americans and staff working for the USA. Vietnamese involved in Operation Phoenix in 1970 are also priority candidates for visas. (Photo by © Jacques Pavlovsky/Sygma/CORBIS/Sygma via Getty Images)

(Original Caption) Queues form outside the American Embassy in the hope of securing visas available to wives, Vietnamese mothers married to Americans and staff working for the USA. Vietnamese involved in Operation Phoenix in 1970 are also priority candidates for visas. (Photo by © Jacques Pavlovsky/Sygma/CORBIS/Sygma via Getty Images)