Army installations of the future will most likely be shaped and influenced by trends and pressures external to the Army, such as technology changes and land-use pressures. RAND Arroyo Center conducted a study for the Army's Office of the Assistant Chief of Staff for Installation Management to assess how trends external to Army installations out to 2025 may affect the Army's ability to provide quality installation services and infrastructure. Trend areas examined include: loss of biodiversity, urbanization and sprawling communities, sustainable buildings, energy, sustainable transportation, water scarcity, sustainable communities, societal trends, sustainable agriculture, online communities, climate change, robotics, and pervasive computing. RAND researchers found that such trends have the potential to cause harm to installation operations including testing, training, and construction activities; to cost or save the Army significant amounts in the future; to hurt or improve Soldier and Family quality of life; to improve installation operations; to help meet future installation requirements; and to improve or hurt environmental conditions. This report provides the final study results, including findings about what the key trends are and how they are likely to affect installations, sources for tracking the trends, and the study team's recommendations about Army actions to take advantage of positive trends and mitigate the impact of negative ones.