and was replaced as VCNO by Vice Admiral John D. Price. On 10 August, Truman signed amendments to the National Security Act, which created the new position of Chairman of the Joint Chiefs of Staff, and he appointed Bradley to the position. A research group, OP-23, a naval intelligence unit formed in December 1948 by Denfeld to advise him on unification and later headed by Captain Arleigh Burke, had been gathering information to help defend the Navy's position, including material critical of the B-36's performance and capabilities. In April 1949 what became known as the Anonymous Document appeared. It pointed out that prior to his posting as Secretary of Defense Johnson had been on the board of directors of Convair, the manufacturer of the B-36 bomber, and was the head of Convair's law firm. The document highlighted his apparent conflict of interest in representing the government with this manufacturer. It went on to claim that the B-36 was a "billion-dollar blunder" and alleged "fraud" on the part of B-36 contractors regarding costs, capabilities and test results. The document was sent to Glenn L. Martin, the chairman of the Glenn L. Martin Company, and several members of Congress. Congressional hearings At first there was little sign that Congress would conduct an investigation of the Anonymous Document. Senator Millard Tydings, the Chairman of the Senate Armed Service Committee, was a close friend of Martin's, but was wary of the contents of the Anonymous Document. Carl Vinson, the Chairman of the House Armed Services Committee had concerns about the ongoing publicity campaigns of the Navy and Air Force, particularly the leaking of classified information. This included the publication by a United Press reporter, Charles W. Corddry, that the United States was targeting 70 Soviet cities for strategic bombardment. With the influential Tydings unwilling to act, Congressman James Van Zandt introduced a resolution in the House of Representatives on 25 May 1949 calling for an investigation of contract awards and cancellations. Vinson saw this as a challenge to his authority, and on 1 June submitted his own resolution that the House Armed Services Committee be authorized to conduct an investigation into the procurement of the B-36. The House adopted Vinson's resolution on 8 June. The first phase of the House Armed Services Committee hearing and investigation on "Unification and Strategy" was held from 9 to 25 August 1949. The focus was on the allegations