From here:
http://en.wikipedia.org/wiki/Joe_Lieberman
In the 110th Congress, Lieberman is Chairman of the Homeland Security and Governmental Affairs Committee, which is responsible for assuring the efficiency and effectiveness of the Federal Government. In addition, he is a member of the Environment and Public Works Committee; Senate Armed Services Committee, where he is Chairman of the Subcommittee on Air Land Forces and sits on the Subcommittee on Emerging Threats and Capabilities; and the Small Business Committee.