Robert Francis and Jack Kelly appeared in "They Rode West" (1954).
The posters and arm band have Chinese characters on them instead of Korean characters.
When Keye Luke's character turns up, one of the prisoners shouts "Here comes Charlie Chan!" as a warning. Luke famously played Lee Chan, the number one son, in the Charlie Chan films.
Because of the Cold war hysteria, this film was accused of being pro Communist and banned from different cities in The United States.