SOVIET GROSS CAPABILITIES FOR ATTACK ON THE US AND KEY OVERSEAS INSTALLATIONS AND FORCES THROUGH MID - 1959
....The following planning factors, based largely on US experience, have been assumed: u. 90 percent of aircraft at home base in commission after stand-down; b. 85 percent of those aircraft departing home bases can be launched from staging bases (includes attrition enroute to and while at staging bases) ; c. 80 percent of these bomber aircraft launched on unrefueled missions will arrive in target area (excluding combat attrition) ;