[A Navy Vet]

" I think they want bollards because they are tied of whack-a-mole, with frequent cutting of breaches, and having to find and repair them."

I'm not sure BP wants actual bollards since the definition says short posts used for protecting buildings and such. You see them all the time now. I think BP has been very happy with the double fencing in San Diego. I'll check to see what their current thinking is, but it's not bollards unless they have their own definition.

[BeauBo]

They use the term bollards for this type of barrier (Series of steel posts, that you can see through), even if it is thirty feet high.

They are often filled with concrete, and very difficult to attack with sledgehammers, chisels, saws or torches. They stand up much better than other barriers that have been tried - they will stop a truck. Border Patrol places a high value on being able to see what is on the other side.