Bagheera, you explained the Moving Target Indicator principle quite well and that is the problem with mill blades and primary RADAR in line of sight.
dave1010;
your para C. Primary RADARs don't cross reference with other RADAR heads. The display shows what the head sees (Army!?).
your para D. Had there been a non frangible windmill on Phuket aerodrome, it may well have stopped OG 269 from veering into the embankment.