The Things They Carried by Tim O'brien is a great read that talks about what it was like to be a young man being drafted and sent to Vietnam from his own perspective. He continues the story in 2 more books called Going After Cacciato and If I Die In A Combat Zone.

Do you know where your father was stationed? That would help a great deal. Wartime experiences, even early on during the period of American escalation, tended to differ depending on location. Also it would help if you could say what branch your father served in.

I absolutely must put "Letters From Long Binh" at the top - great read, an autobiography by an MP who was in Vietnam. It is set in '66-'67. Multiple awards for great writing.

I can also recommend "Vietnam Convoy Trucker". It is an autobiography of a Spec 5 who was drafted and became a convoy trucker. The caveat is that it is set in '68-'69, which was a very different war from '65. Also, he is a truck driver, not an MP.

"Combat Police"; dry but informative. It is a look at the experience of MP units as an analysis through their TO&E and other organizational documents.

Also: read this; interesting read by a trucker in Nam.

Search for "Gun Truck". The gun trucks were generally converted Deuce-and-a-Halfs or 6byes that had their beds up armored and stuffed with machine guns, both M-60's and M-2's, and provided convoy protection. I cannot find an autobiography on this, but I have one somewhere in my library that if I find I will post.