In the first half of 1944, battle casualty rates for every 1,000 bomber crewmen serving six months in combat included 712 killed or missing and 175 wounded: 89 percent. By one calculation, barely one in four U.S. airmen completed twenty-five missions over Germany, a minimum quota that was soon raised to thirty and then thirty-five on the assumption that the liberation of France and Belgium and the attenuation of German airpower made flying less lethal.
