I was a little surprised that they used wire-link fence in the simulated compound. Regardless of whether it caused the first helicopter to crash it seems to me a real wall would have made the training more effective.
I wouldn't be surprised to hear that defense contractors have already come up with quickly deployable simulated walls.
I think the article's a bit wrong on that part. DEVGRU, Special Operations outfits, and even conventional US forces have access to walls and don't use chain-link simulations.
It's not. And modular walls are quicker than chain-link. Army SF commonly uses framed plywood walls with locking, thick metal drop hinges on each side, roughly how a ranch gate works.
They're modular so that they can be quickly re-arranged, not to hide from satellites.
I wouldn't be surprised to hear that defense contractors have already come up with quickly deployable simulated walls.