From Wikipedia

They Chose China

During the Cold War, a number of pilots from Communist or non-aligned countries defected to the West. Though rare, these incidents were of great value to Western military intelligence services because they provided operational, undamaged planes of Soviet or indigenous origin which could then be studied.

It is January 1954. The Korean War is over. Captured UN soldiers held in POW camps are free to return home. Those who refuse repatriation to their homeland are transferred to a neutral zone and given 90 days to reconsider their decision. Among them are 21 American soldiers who decide defiantly to stay in China. Back in the United States, McCarthyism is at its height. Many Americans believe these young men have been brainwashed by Chinese communists through a new form of thought control. But what really happened? Featuring never-before-seen footage from the Chinese camps as well as interviews with former POWs and their families, They Chose China tells the fascinating stories of these forgotten American dissidents. With the Cold War fading into memory, Oscar-nominated filmmaker Shuibo Wang (Sunrise Over Tiananmen Square) aims his camera on this astonishing story. In They Chose China, we meet and begin to understand a group of courageous men who fought for and then cut ties with the USA.