This operation was akin to earlier SD efforts in Austria; however, unlike Austria, the Czechs fielded their own Secret Service, against which Heydrich had to contend.[33] Once "Case Green" began, Heydrich's SD spies began covertly gathering intelligence, even going so far as having SD agents use their spouses and children in the cover scheme. The operation covered every conceivable type of intelligence data, using a myriad of cameras and photographic equipment, focusing efforts on important strategic locations like government buildings, police stations, postal services, public utilities, logistical routes, and above all, airfields.[34]