Arlington, Va. (UPI) Mar 27, 2009 – The developments most likely to interrupt the ability of the United States to carry out missions up to and including conventional airstrikes and thus imperil deterrence come from a range of technologies. Developments in these areas can be seen as pacesetters.Part 11: The primary role of fifth-generation air superiority fighters in guaranteeing the deterrence capabilities of the U.S. Air Force.