We are in a Walmart parking lot in Nogales. Captain Pain and a couple of others go into the store to get supplies. In Pain‘s absence, Showtime is our commanding officer. He is a Marine special-ops veteran who did three tours in Afghanistan. He has camo paint on his face and a yeti beard. He gets in the cab to check Facebook on his phone while Destroyer, Jaeger, Spartan, and I stand with our backs to the truck, rifles in hand, keeping watch for anything suspicious. The Mexican border is three miles away.