Hybrid Warfare involves a state or state-like actor's use of all available diplomatic, informational, military, and economic means to destabilize an adversary. Whole-of-government by nature, Hybrid Warfare as seen in the Russian and Iranian cases places a particular premium on unconventional warfare (UW). As such, a response capitalizing on America's own irregular and unconventional warfare skills, as part of a whole-of-government and multinational strategy, can best counter actions of emergent adversaries to destabilize global security. Counter-Unconventional Warfare (C-UW) should thus prove central to U.S./NATO security policy and practice over the next several decades.