Sandia comprises a sprawling complex, much of it inside the gates of Kirtland Air Force Base. Its low, bland buildings, a mix of brick and cement fashioned into the rectangles popular on 1970s college campuses, spread over open terrain dotted with bunkers and the occasional wind tunnel. To the east, the Sandia mountains—so named because, like the desert, they turn watermelon-pink during sunset—loom over the flat floor, looking like they’re lit from within. This lab leads the others in expertise about physical protection: how to keep people physically away from your valuables—your uranium, your armory, your people. That’s why it hosts this training course. Additionally, the instructors are experts in transportation security, nuclear safeguards, international policy, and risk management.