Flying nap of the Earth with a Cobra probably works because he knew the location where the AA system was located, there were no other "combatants", no air cover or spotters/infantry along the route to inform the AA that helicopter is flying low.
SF story about circling back is fun, but in a real scenario it would mean you kill a couple of guys but end up surrounded by unknown number of people and infantry.
Red, commanded by retired Marine Corps Lieutenant General Paul K. Van Riper, adopted an asymmetric strategy, in particular, using old methods to evade Blue's sophisticated electronic surveillance network. Van Riper used motorcycle messengers to transmit orders to front-line troops and World-War-II-style light signals to launch airplanes without radio communications.
Red received an ultimatum from Blue, essentially a surrender document, demanding a response within 24 hours. Thus warned of Blue's approach, Red used a fleet of small boats to determine the position of Blue's fleet by the second day of the exercise. In a preemptive strike, Red launched a massive salvo of cruise missiles that overwhelmed the Blue forces' electronic sensors and destroyed sixteen warships: one aircraft carrier, ten cruisers and five of Blue's six amphibious ships. An equivalent success in a real conflict would have resulted in the deaths of over 20,000 service personnel. Soon after the cruise missile offensive, another significant portion of Blue's navy was "sunk" by an armada of small Red boats, which carried out both conventional and suicide attacks that capitalized on Blue's inability to detect them as well as expected.
https://en.wikipedia.org/wiki/Millennium_Challenge_2002Burying your head in the sand only makes you part of the problem.
Fortunately for everybody, I have no influence on any military nor political force anywhere. Or any relevant responsibility for that matter. The world is safe from my wrong opinions.
Thus you have discounted the strategy that disclosing exactly what happened misleads future enemies the most.
Such as the fact that the motorcycle messengers traveled at the speed of light to instantaneously transmit orders. The fact that the salvo of cruise missiles came from boats which could not carry them, and the fact that simulator's fleet defenses were turned off to prevent them from targeting commercial air and commercial shipping.
"Van Riper famously used "motorcycle couriers" to get around the destruction of his C2 network. The problem was that this was handled as simple handwaving, with him saying that he would use motorcycle messengers to handle all the message traffic. Despite supposedly doing so, he continued to relay messages as if he doing so with a normal communications network. Essentially, his motorcycle messengers were treated as being just as efficient as an electronic communications network. Clearly, that wouldn't be possible, hence the folks joking about "light speed motorcycles"."
[0] https://www.reddit.com/r/WarCollege/comments/la7elp/so_what_...
The top brass then "re floated" and announced the US Navy must sail from Pearl and so be ambushed, as per plan.
So, yeah, risk management is everything