what does fafo mean in military

In the military context, "FAFO" stands for "F*** Around and Find Out" (also sometimes rendered as "Fool Around and Find Out"). It is a blunt warning or threat meaning that if someone engages in reckless or ill-advised behavior, they will face the consequences. The phrase implies a tough, no-nonsense stance that actions will have serious repercussions. This term has been recently popularized in U.S. military rhetoric as a message to adversaries, emphasizing readiness to respond forcefully to challenges.