Unmanned aerial vehicles (UAVs) are evolving into a preferred method of accomplishing overhead military intelligence, surveillance and reconnaissance (ISR). Capable of carrying a variety of sensors and electronic tools, they can provide real-time still and video imagery, collect signal intelligence, support communication links, conduct electronic jamming and even deliver munitions on targets. Their long loiter time, low detectability, relative inexpensiveness and low-risk due to their unmanned nature have caused a revolution in battlefield surveillance.