K52,
You said "How do you justify the assertion that this was a "milk run"? If that was the case then there would have been a standard Flight Plan".
Although some fixed wing squadrons may have used "standard flight plans" As far as I am aware, certainly at that time, this was not generally the case for rotary wing ops as it wasn't / isn't appropriate on this type of flight.
It is misleading to attempt to apply fixed wing thinking to rotary ops.