The Short End by Gene L. Coon

Gene L. Coon (1924–1973) is probably best remembered for his work on the original Star Trek as a screenwriter, story editor, and showrunner. Before that, in 1950, he participated in the Korean War. In this book, he processed his experiences. From Wikipedia:

The Short End of the Stick (published 1964) is a novel dealing with the lives and problems of American troops stationed along the DMZ in Korea after the war ended. It includes how they got along with and were treated by the native Koreans, focusing on sex and cultural clashes. It is also one of the earliest publications to discuss the drug problems of the bored occupation troops and how commanders dealt with them.

For Dell’s paperback edition, the title was shortened to The Short End. Illustration by Harry Schaare.