...two decades, the United States has dramatically changed the way in which it projects its power overseas by outsourcing foreign affairs functions to an arguably unprecedented degree. At the high point of the combined conflicts Iraq and Afghanistan, the U.S. Government had hired roughly 260,000 contractors—more contractors than troops—to do everything from support tasks, such as delivering meals to soldiers, cleaning their latrines, and maintaining
battlefield weapons systems, to more combat-related functions, such as guarding bases, diplomats, and convoys. At times, contractors even conducted interrogations. And contractors continue to play...