Examples of ISR systems include surveillance and reconnaissance systems ranging from satellites, to manned aircraft such as the U-2, to unmanned aircraft systems such as the US Air Force’s Global Hawk and Predator and the US Army’s Hunter and PSST Aerostats, to other ground-, air-, sea-, or space-based equipment, and to human intelligence teams. The intelligence data provided by these ISR systems can take many forms, including optical, radar, or infrared images or electronic signals. Effective ISR data can provide early warning of enemy threats as well as enable military forces to increase effectiveness, coordination, and lethality, and demand for ISR capabilities to support ongoing military operations has increased.[2]