The Center for Naval Analyses is a non-profit military research organization funded by the US government which aims to provide research and analysis for policy decisions. It is the federally funded research and development center (FFRDC) for the United States Navy and Marine Corps.
It’s Military Advisory Board (see below) did a report in 2014 called “National Security and the Accelerating Risks of Climate Change.” It was signed by Former Secretary of Homeland Security Michael Chertoff and Former Secretary of Defense Leon PanettaThe report begins:
The nature and pace of observed climate changes—and an emerging scientific consensus on their projected consequences—pose severe risks for our national security. During our decades of experience in the U.S. military, we have addressed many national security challenges, from containment and deterrence of the Soviet nuclear threat during the Cold War to political extremism and transnational terrorism in recent years. The national security risks of projected climate change are as serious as any challenges we have faced.