During World War II, a group known as “Detachment 101” of the Office of Strategic Services (the precursor of the CIA) started to work inside Burma to gain intelligence about and to harass the Japanese by means of guerilla attacks.

They relied heavily on soldiers that they recruited from the Kachin, a group that came to be known as the “Kachin Rangers.”

Kachin Rangers

I just came across a couple of videos that the US National Archives have made available online that were made during World War II and that depict the training of Kachin Rangers.

Depending on the type of browser you are using (and whether or not it is up to date), you might have trouble viewing the videos in a browser, but they can be downloaded to your computer and viewed through Widows Media Player.