The E-2 Hawkeye is the US Navy's airborne early warning and control aircraft. Launched from an aircraft carrier, it uses computerised sensors housed in a 24 feet (7.3 metres) diameter rotating flat dome above the fuselage to provide information of potential threats to a carrier group during military operations.
The "eyes of the air wing", the latest E-2C+ version can track more than 2,000 targets at the same time.
This means that while an aircraft carrier concentrates on launching attacks, it can be assured that there is a team watching its back for potential attacks, such as in-coming missiles or aircraft.
It is a twin propeller aircraft with five crew: two pilots and three specialists to operate the equipment.
The airflow around the radar dome means the plane has a peculiar tail, with four vertical surfaces.
It can stay in the air for more than five hours without refuelling, giving it a range of more than 1, 200 miles (1, 930 km) from its carrier at up to 37,000 ft (11, 280 m).