https://www.google.com/collections/s/list/RI1qDQ3HAcSk1ar7WRLFpV97urxFxQ/2i8bX2tXl_E
Really interesting article on how effective the Republic of Korea (South Korea) Marines were when they fought in the Vietnam War.
I had heard about them back circa 1980 when one of my martial art instructors had served in Vietnam and had worked with the ROKs, and even later spent a few years in Korea training Tae Kwon Do alongside sone veterans there, and it infused his perspective on real fighting. IT had a profound affect on my 16 year old brain.
Check this out: