The Goldwater-Nichols Department of Defense Reorganization Act of 1986 is the most important legislation to affecting U.S. national defense in the last 50 years. This act resulted from frustration in Congress and among certain military officers concerning what they believed to be the poor quality of military advice available to civilian decision-makers. It also derived from the U.S. military's perceived inability to conduct successful joint or multi-service operations. The act, passes after four years of legislative debate, designated the Chairman of the Joint Chiefs of Staff as the principal.