While the Defense Department is moving to conduct congressionally required environmental site surveys for ground-based interceptor bases on the U.S. East Coast, a final assessment about whether such installations will be needed in the first place has yet to be made, Chairman of the Joint Chiefs of Staff Gen. Martin Dempsey told lawmakers. "We have other options, to include sea-based," Dempsey told members of the House Appropriations defense subcommittee during an April 16 hearing. "But we want to do the...