sentences:  This triggered the Cuban Missile Crisis, sending the US intelligence community into maximum effort and triggering an unprecedented military alert.The October 14 high-altitude photographs, taken from the periphery of Cuba, led to the US taking the additional risk of direct overflights of Cuba, at the orders of Secretary of Defense Robert S. McNamara.McNamara, Chief of Naval Operations George Whelan Anderson Jr and Lundahl concurred that the US Navy's Light Photographic Squadron VFP-62, flying F8U-1P Crusader fighters in a reconnaissance role, were best qualified to take low-level photographs, flying directly over Cuba.