An Israel Aero Space Industries (IAI) Heron 1 unmanned aerial vehicle (UAV) rolls on a tarmac during a media presentation at the airbase in the central Swiss town of Emmen September 20, 2012. The Swiss air force is currently evaluating the reconnaissance drone aircrafts of two Israeli companies, to replace its existing system. REUTERS/Arnd Wiegmann (SWITZERLAND - Tags: MILITARY TRANSPORT BUSINESS)