The operation was run out of GCHQ headquarters in Cheltenham, with most of the surveillance taken from RAF Troodos, a Royal Air Force highly advanced and sophisticated communications and intelligence installation in the Troodos Mountains of Cyprus, with RAF Menwith Hill, a joint US-British satellite surveillance base in Britain, also participating. The Israeli Air Force's UAV fleet was its primary target. Encrypted video transmissions between drones and their bases were intercepted from Troodos and analyzed using powerful advanced computing systems, as well as the open-source software tools ImageMagick and AntiSky, which allow users to patiently sort through the pixels in order to decrypt them. This was the preferred method over using the massive computing power it would have taken to unscramble the encrypted signals in near real time. Some images were clearer than others, as the success of the decryption varied. The intercepted images were largely low-resolution analog feeds used to check the condition of the drones, allowing the NSA and GCHQ to see the payloads the drones were carrying, but not the actual surveillance data. Surveillance feeds were, however, sometimes captured from small Israeli drones. GCHQ and NSA also successfully breached the security of Israeli military and communication satellites which were encrypted.