The writer served in Vietnam as an eighteen year old marine. He experienced Vietnam at its worst. At such a young age, his experiences were imprinted upon his memory in a way that PTSD will permanently engrave the past forever. His poems are not the run of the mill war poems, but poems of beauty. And you ask, "How can war poems be poems of beauty?"
Take a chance and read, and judge for yourself. Experience the raw pain, and experience the healing of the soul. Walk in this marine's boots. Follow the path he has followed for more than forty years. Take the dare.