"Alright, we have this huge highway system that can get a lot of us anywhere pretty quickly. However, we need a way to secretly deploy troops in places."
"Obviously, because we're the secret government!"
"How about we build tunnels out of our bases, so we can pop out in strategic places?"
"Where should these tunnels be?"
"We could build them under Walmarts!"
"How much would that cost?"
"Hundreds of millions of dollars per mile."
"How long would this take."
"By god Sargent, you're a genius."