There are a few other good books on the subject of the past unpleaantness in SEA.
Low Level Hell by Hugh L. Mills, whoose machine is displayed in the army aviation museum at Ft. Rucker, Ala. OH-6A Cayouse Scout "Low Level Hell"
Firebirds by Chuck Carlock, was another one,
And last, We were soldiers once, and young, which has nothing really to do with helicopters, but actually mentions Robert Mason in regards to the Ia Drang Valley
Must say, these stories are harsh, but good, and in my opinion severely readable
