CIA-operated airline, Air America, was also involved in Operation Frequent Wind and deployed much of their Huey helicopter fleet. The operation ended on the morning of 30 April 1975 following the evacuation of U.S. Ambassador Graham Martin and the last U.S. Marines in Saigon. Carter Administration Following Gerald Ford's defeat in the 1976 Presidential election and Jimmy Carter assuming the presidency on January 20, 1977, General George S. Brown remained to serve as Chairman of the Joint Chiefs of Staff under Carter Presidency. Before Carter assuming the Presidency, Brown along with Secretary of Defense Donald Rumsfeld already briefed the incoming Carter administration National Security team including Carter appointed Secretary of Defense Harold Brown about all of the important policy that had been taken during Ford administration and shall be continue under Carter administration such as the SALT II Treaty Talk. Brown and Rumsfeld also gave Carter and his incoming National Security team a tour of The Pentagon in December 1976. Brown and Carter new Secretary of Defense Harold Brown worked together on a military policy especially the incoming SALT II Treaty and the continuation of Détente policy.However, there's been some differences take on military matters between Ford and Carter administration in which Brown disagreed with some of it such as Carter campaigned on a pledge to make the Pentagon more efficient, which led to the cancellation of some of importance military modernization program. As a result, the B-1B Program whom Brown is strongly support it, was cancelled under the Carter Administration. Brown also strongly opposed Carter decision to withdraw the United States Military from South Korea May 1977. But at some point Carter and Harold Brown did also agree with Brown about the important role of Strategic Air Command as the nations primary nuclear deterrence. Both Carter and General brown agreed that it was only Strategic Air Command that can anticipate and deter the incoming attack from United States adversary that was known as "First Strike" especially in time of national crisis that could escalate to a major crisis. During the Carter administration, a talk began with the government of Panama handover the Panama Canal and led to the Panama Canal Treaty. On September 26, 1977, Brown gave a testimony to House Committee on International Relations regarding his opinion on Panama Canal Treaty. Brown's remarks was very essence and Brown also emphasized about the important need of United States use