Author Dennis Foley put in his time in Vietnam. When he returned to the States, the Army assigned him to liaison duty with Hollywood crews making shows or movies on Army bases or using Army equipment. After leaving military service, Dennis became a writer and producer on such shows as China Beach, MacGyver, Airwolf, and Cagney & Lacey.
The characters, settings and situations in this gritty book seem real because (1) Dennis is a terrific writer, and (2) he put unflinching honesty into every page.
Try it - you'll like it!