What should the U.S. Army look like in 20 years? Using the tool of alternative futures analysis, this study attempts to help the Army with force planning for the 2025 era. It lays out a spectrum of different “future worlds” to illustrate the complete universe of future missions. Analyzing possible trends across five key areas (geopolitics, economics, demographics, technology, and environment), the study defines six alternative futures and postulates an appropriate “Army type” for each one.