I am searching for James P Riffle. He would have served in Pakistan from Sept 1963 through Dec 1964. He would have known my father James Mattocks. Please help.

Do you have more info? Like bases, squadrons, ranks, etc.
Also post this on the Missing persons-Reunion forum. Go back to the main page and scroll down thru the headings. That forum is pretty far down the pge.
Good luck on your search.