The successful application of the Fifth Generation of Warfare (5GW) is "indistinguishable from magic" (Rees 2009, following in the spirit of Clarke's Law, propounded by the author of 2001: A Space Odyssey) "any sufficiently advanced technology is indistinguishable from magic"). The Fifth-Generation warrior hides in the shadows, or in the static. So, then, how can analysts and researchers study and discuss 5GW? Other questions also demand answers. What is the xGW framework, which many theorists use to describe 5GW? What alternatives to the xGW framework exist? What 5GWs have been observed? What are the source documents for the xGW framework? What is the universe of discourse that the xGW framework emerged from? Why bother trying to understand 5GW? This handbook attempts to provide systematic answers to these questions in several major sections, each of which is written by many contributors. While this handbook records many different voices of 5GW research, it speaks with one voice on the need to understand 5GW, the fifth gradient of warfare.