Then as now if a unit looks alert and performs minor actions competently, most of the bad guys will leave them alone and await an easier target. Long time ago it was learned in such operations to never, ever do the same thing twice and never stay anyplace for more than 12-16 hours without modifiying your strength and positions. The basics aren't that hard -- we just do not teach them well.

And, like the Floating Platoon, sometimes even those that know just get lazy or sloppy -- always a killer...