In its Fiscal Year 2012 Climate Change Adaptation Roadmap, the Department of Defense (DOD) identified climate change phenomena such as rising temperatures and sea levels as potentially impacting its infrastructure, and officials at sites GAO visited or contacted noted actual impacts they had observed. This book describes potential impacts identified by DOD that may affect its infrastructure; evaluates DOD's efforts to conduct vulnerability assessments; assesses how DOD is accounting for climate change impacts in certain planning efforts; and evaluates the extent to which DOD incorporates adaptation into its infrastructure-investment efforts.