Coming in high and fast keeps the bad guys from reaching out and touching you,
An interesting simplification! So if I was flying a steep-approaching F16/15/3 etc, I'd be invulnerable? I think Mr Grindrod is gilding his own lily.
The point of the Khe Sanh (I note the spelling correction from my last post), or any more recent description of the procedure, is to make the flight path unpredictable to the - hopefully - inexpert potential aggressor. The specific techniques used will inevitably vary depending on the enemy's capabilities, the aircraft's capabilities, the surrounding terrain, the weather, and what may reasonably be asked of the average crew. There is
no standard that can be applied to all transport aircraft in all situations.
I repeat: the display 'Khe Sanh' is just that: a display, as in entertainment for an audience. I feel reasonably well qualified to make that statement!