If V Corp were brought home and given the mission, “Secure our border,” how long would it take?
Overnight.
About 2 days. But they would need harsh ROE. The more practical solution is to build the type of multiple parallel fences they have in San Diego along the entire border. The fedgov already owns the land, the 100 yard strip. They could solicit bids from a dozen fencing contractors, and with rewards and penalties, get the entire thing built in a matter of months.