Editing Robert McNamara (section)

====Heightened alert====
McNamara raised the proportion of [[Strategic Air Command]] (SAC) strategic bombers on 15-minute ground alert from 25% to 50%, thus lessening their vulnerability to missile attack. He also approved [[Operation Chrome Dome]] in 1961, in which some B-52 strategic bomber aircraft armed with thermonuclear weapons remained on continuous airborne alert, flying routes that put them in positions to attack targets in the Soviet Union if they were ordered to do so. This would lead to a number of [[United States military nuclear incident terminology#Broken Arrow|Broken Arrow]] nuclear weapon accidents.<ref group=Note>The U.S. strategic bomber airborne alert operation, code-named [[Operation Chrome Dome|Chrome Dome]], was also seen as a realistic training mission</ref>{{sfn|Croddy|Wirtz|2005}}