A Greek Air Force officer operates the radar of a Patriot air defence missiles at Tatoi air base, north of Athens July 27, 2004. Dozens of new Pac 3 (Patriot Advanced Capability) missiles were armed and in position at three locations around Attica basin providing an air defence umbrella over the Greek capital as part of a massive security plan to safeguard the upcoming Athens 2004 Olympic Games. REUTERS/Yiorgos Karahalis YK/AA – RTRU50W