Below, thanks to great effort and work of personel and students of "Texas Tech University", within the universitys "Viet Nam War Project"-section.

Enter "OP FILE" (without qoutationmarks) in searchfield of:
http://www.virtualarchive.vietnam.ttu.edu/starweb/virtual/vva/servlet.starweb
(Note by A.B:
Above yields appx 190 searchresults, of which 1 example is regarding "Operation Medina", by autum of 1967. Some main results of these 190 such, may however hold more than only 1 file ((usually in pdf-format)).
End note by A.B).

Also check for example....

Enter "US Marine Corps" (without qoutationmarks) in searchfield of:
http://www.virtualarchive.vietnam.ttu.edu/starweb/virtual/vva/servlet.starweb
(Note by A.B:
Above example yields appx 500 "plus" main results. ((Some main results contains more than 1 single pdf-file...)). In 2nd / direct above example, the "Operation Medina"-report is Not displayed for some reason. I am not 100 percent clear on how the searchengine functions, as far as "choosing" what to display, after a search.... One would think that the latter example would include a display of also the "OP Medina"-file, by the searchparameter entered, but "nope, it does not".... A fact I yet am to understand. Never the less, a good info-source, that it is!
End note by A.B).

Just wanted to share. T G C!

Sincerely
A.B