Francis Gary Powers was no doubt stunned to find his U2 spyplane tumbling from the skies in 1960 thanks to what I can only imagine is inherent bias in the war room against the enemy. Its also worth noting the Tupolev TU95 bear left Washington scratching its heads for nearly a decade, furiously revising the numbers for speed and range. https://web.archive.org/web/20081211055010/http://www.aviati...
in 2006 china managed to tail a US aircraft carrier and emerge in torpedo range with a Song 039 type submarine, a generation behind the US, which was previously thought incapable of such an operation. https://thediplomat.com/2015/11/closest-encounter-since-2006...
Those unfamiliar with history text might also recall the day when Iran not only detected but casually landed a sophisticated US military drone at one of its airbases. https://en.wikipedia.org/wiki/Iran%E2%80%93U.S._RQ-170_incid...