N'afọ 1956, Onyeisiala Dwight D. Eisenhower họpụtara Parsons ka ọ bụrụ onye nnọchiteanya mba Amerịka na Laos, onye isi ụlọ ọrụ nnọchiteanya mba Amerịka na Vientiane, ebe Parsons gosipụtara akwụkwọ ikike ya n'Ọktoba 12, 1956. Dị ka onye nnọchi anya alaeze Laos n'etiti agha obodo Laos
, A na-akọwa Parsons na nkwado gọọmentị Eisenhower nke Gọọmentị Royal Lao megide Pathet Lao. Ozi ala ọzọ ya na Laos kwụsịrị na February 8, 1958. Parsons gara n'ihu na-akwado iwu Laotian nke gọọmentị na 1959-61, n'oge ahụ ọ rụrụ ọrụ dị ka osote odeakwụkwọ nke State maka East Asia na Pacific Affairs. (Ọ malitere ọrụ na July 1, 1959, wee hapụ ọrụ na March 30, 1961.) N'ịgba akaebe na United States Congress na Machị 1961, Parsons kwuru "ọrụ nke United States na Laos bụ n'ezie nnukwu ọrụ, enwere m olileanya na a gaghị enwe nghọtahie nke nkwụsi ike na nkwụsi ike anyị". N'akwụkwọ ya nke 1965 "A Thousand Days", Arthur M. Schlesinger, Jr. katọrọ nke ọma onye nnọchi anya Parsons na Laos (Schlesinger kwadoro nnọpụiche ndị America n'etiti ndị eze na ndị nnupụisi), na-ekwu na Parsons "na-aghọtaghị ọnọdụ ahụ nke ọma". Parsons azaghị ajụjụ a maọbụ nke ndị ọzọ yiri ya n'ihu ọha.