And then we have this:

Paul O'Connor, a laboratory technologist who assisted in the autopsy of President Kennedy, claimed that the autopsy at Bethesda Naval Hospital was conducted in obedience to a high command of admirals and generals. O'Connor stated: 

There were kind of mysterious civilian people, in civilian clothes — were there [at Bethesda]. It seemed like they commanded a lot of respect and attention — sinister looking people. They would come up and look over my shoulder, or look over Dr. Boswell's shoulder, and run back, and they'd have a little conference in the corner. Then all at once the word would come down: "Stop what you're doing and go on to the other procedure." And that's the way it was all along. We just jumped back-and-forth, back-and-forth. There was no smooth flow of procedure at all.Turner, Nigel. The Men Who Killed Kennedy, Part 3, "The Cover-Up", 1991.

This doesn't seem like standard practice  even for the military.