The A-4 Skyhawk is a lightweight, single engine attack aircraft, with a design based on experience gained in the Korean War. The "Scooter" is probably one of the most famous attack aircraft ever designed. This short range attack and close support aircraft was originally intended for the US Navy and Marine forces. The design was a quick success, and Skyhawks continue to fly in air forces around the world. There are numerous models of the A-4 in use. All models have two internally mounted 20mm cannons, and are capable of delivering conventional and nuclear weapons under day and night visual meteorological conditions. The aircraft is a very compact design, with no wasted space. The structure is a conventional all metal semimonocoque type. Fitted with automatically operated wing slats and hydraulically operated split flaps. Folding wings were not provided.