The US Marine Corps' AV-8B Harrier II is a V/STOL (Vertical/Short Take-off and Landing) ground-attack aircraft developed by McDonnell Douglas (now Boeing) and British Aerospace. It's a second-generation Harrier, known for its ability to operate from various locations, including ships, forward operating bases, and unprepared surfaces. The AV-8B is primarily used for light attack, close air support, and armed reconnaissance missions.