Concluding that the hydrogen bomb was now required as deterrent as well as an offensive weapon, on January 31, 1950, Truman decided to proceed with development; Johnson supported the president's decision. Truman at the same time directed the Secretaries of State and Defense to review and reassess U.S. national security policy in the light of the Soviet atomic explosion, the Communist victory in the Chinese Civil War, and acquisition of the hydrogen bomb, and to produce a paper based on their new analysis. Johnson went about this task reluctantly, as he had promised Truman he would hold the line on increased defense spending. He was also upset that the State Department had first taken the lead on the policy assessment and had heavily influenced the contents of the resultant report NSC 68.