the still-segregated 24th Infantry Regiment was court martialed and sentenced to death for refusing to obey the orders of a white officer while serving in the Korean War. Gilbert maintained that the orders would have meant certain death for himself and the men in his command. The case led to worldwide protests and increased attention to segregation and racism in the U.S. military. Gilbert's sentence was commuted to twenty and later seventeen years of imprisonment; he served five years and was released. The integration commanded by Truman's 1948 Executive Order extended to schools and neighborhoods as well as military units. Fifteen years after the Executive Order, Secretary of Defense Robert McNamara issued Department of Defense Directive 5120.36. "Every military commander", the Directive mandates, "has the responsibility to oppose discriminatory practices affecting his men and their dependents and to foster equal opportunity for them, not only in areas under his immediate control, but also in nearby communities where they may gather in off-duty hours." While the directive was issued in 1963, it was not until 1967 that the first non-military establishment was declared off-limits. In 1970 the requirement that commanding officers first obtain permission from the Secretary of Defense was lifted, and areas were allowed to be declared housing areas off limits to military personnel by their commanding officer. Since the end of military segregation and the creation of an all-volunteer army, the American military saw the representation of African Americans in its ranks rise dramatically. Korean War Jesse L. Brown became the U.S. Navy's first black aviator in October 1948. He died when his plane was shot down during the Battle of Chosin Reservoir in North Korea. He was unable to parachute from his crippled F4U Corsair and crash-landed successfully. His injuries and damage to his aircraft prevented him from leaving the plane. A white squadron mate, Thomas Hudner, crash-landed his F4U Corsair near Brown and attempted to extricate Brown but could not and Brown died of his injuries. Hudner was awarded the Medal of Honor for his efforts. The U.S. Navy honored Jesse Brown by naming a frigate after him—the USS Jesse L. Brown (FF-1089). James H. Harvey (born July 13, 1923) became the U.S. Air Force's first African-American jet fighter pilot to engage in combat during the Korean War. Two enlisted men from the 24th Infantry Regiment (still a segregated unit), Cornelius H. Charlton and William Thompson, posthumously