The Vietnam War had a significant effect on JASON's membership and research focus. A major initiative of JASON became the McNamara Line electronic barrier, promoted by the hawks. (According to Freeman Dyson, a member of JASON, this research was actually not carried out by JASON, but by a group called JASON EAST). By around 1966, the team had become strongly divided along political and ethical lines. In March 1967, Freeman Dyson, Robert Gomer, Steven Weinberg, and S. Courtenay Wright produced a report, approved by Secretary of Defense Robert McNamara and titled "Tactical Nuclear Weapons in Southeast Asia." Declassified in 2002 through a Freedom of Information Act action brought by the Nautilus Institute, the paper predicted catastrophic consequences for U.S. global interests as well as for the people and environment of Southeast Asia of a tactical nuclear weapons strike in the area. Going into great detail, the paper strongly contradicted game-scenario research from the RAND Corporation and other groups that was optimistic about a nuclear option. Co-author Wright later stated that the report's main finding was that "employment of nuclear weapons by the US would be of little use against a widely distributed opponent but disaster if copied by the opponent." In a nuclear counterstrike against U.S. troops, the report concluded that, in the worst-case, "the U.S. fighting capability in Vietnam would be essentially annihilated." Co-author Weinberg showed the political point of view of the writers and the increasing political division: