With the end of our commitment in Iraq and as we begin the drawdown of forces in Afghanistan, the Nation, the Department of Defense, and the Army are beginning a strategic transition from fighting and winning current wars to preparing for the challenges beyond them. Simultaneously, the US Government faces a fiscal and budgetary crisis that will shape the strategic landscape and inform our preparations for future conflicts. Addressing the uncertainty of the current security challenges facing the nation, our nation's senior leaders have specified in official policy and planning documents that our Armed Forces must be agile and adaptable. This paper seeks to explore the historical evolution of agility as a doctrinal term, comb out the specified tasks that agility will require of Army forces, and discuss the practical implications of agility and adaptability for Army leaders, specifically by focusing on fires, one of the six nested warfighting functions, as a case study.