The combination of fiscal constraints, expanding technology and globalization is causing the nature of warfare to rapidly evolve. The wars of tomorrow will not look like today's war. The ability to adapt to changing warfare environments hinges on a leader's ability to think broadly and view the operation through the lens of the entire conflict. This paper analyzes how Admiral Raymond A. Spruance prepared for the challenge of conducting amphibious assaults in the Central Pacific during World War II. Further, the paper uses Admiral Spruance's development as an operational thinker as a case study for today's leaders to prepare for the challenge of adapting to future operational environments. Admiral Spruance's operational education, operational training and experiential base is discussed and recommendations are provided to help today's leaders prepare for tomorrow's battles.