After college, he was commissioned as an ensign in the U.S. Naval Reserve on June 16, 1965, and served as a
U.S. Navy officer with
Underwater Demolition Team 11 (
BUD/S Class 36). After completing BUDS he served for two years in Vietnam with the Navy SEALs. He remained in the Naval Reserve after leaving active duty and was promoted to lieutenant commander on April 1, 1974. He would later then go onto serving in the
U.S. State Department as a foreign service officer in
Washington, D.C. and the
Upper Volta. a Trustee of the
Alliance for Climate Protection, a member of the Governing Council of
The Wilderness Society (United States), and a Trustee for the
American Museum of Natural History, the
World Resources Institute, and The Cultural Institutions Retirement System. He is also a Counselor for the China–U.S. Center for Sustainable Development. He sits on the Advisory Council of the nonpartisan anti-corruption organization
Represent.Us, where he served as a consultant in the crafting of the
American Anti-Corruption Act. At the Republican Convention in 2000, Roosevelt delivered an address on the environment. He gave the keynote speech at the National Governors Association Annual Meeting in 2001 as well as the keynote address at the Governors Conference on Climate Change in April 2008 sponsored by
Yale University. Most recently, he spoke at the Conference of Parties Climate Summit in December 2009 in Copenhagen sponsored by the European Union Parliament. On April 18, 2016, the day before the
New York Republican primary, Roosevelt endorsed Ohio Governor
John Kasich for president of the United States. Roosevelt suggested on
Twitter that
Donald Trump was the "loser" following a report in
The Atlantic that Trump chose not to visit an American military cemetery in France, with Trump allegedly saying "Why should I go to that cemetery? It's filled with losers." ==Personal life==