Some readers tell us that the M-61 20 mm Vulcan cannon fires about 6,000 rounds per minute not second—that’s a big difference.
Air Force Secretary Frank Kendall doesn’t see great value in trying to break the Sentinel ICBM program off as a separate budget item the way the Navy has with its ballistic-missile submarine program, saying such a move wouldn’t create any new money for the Air Force to spend on other…