I can -- but I don't have to. I SAW them. Many of then went into a holster when issued, and were never taken out until they were turned in a year later. These guns were drenched in monsoons, covered with mold that was just wiped off the holster (but not the gun) now and then, and so on.
When Dock Bahnsen (later a general) was shot down, they kept trying to locate him, but couldn't find him. What was happening was the gunships were making passes at the NVA around him, and Doc, instead of waiting for the slick to pick him up, would charge the NVA, running along under the gunships.
He quit when he got a shot at an NVA and found his gun frozen solid.