No matter what happens, these former Marines are ready to survive. Joel, Mark and Mike use what they have on hand to teach and test their clients' survival skills. At the shop, young gunsmith Tommy wants to learn about other weapons he could use to survive. With Jimmy's knowledge and survival skills, Tommy will be able to take his prepping to the next level. Later, Joel and Mike head to the home of a Vietnam vet who wants to retrofit his house to bug in.