The Cessna O-1 Bird Dog is a light observation aircraft developed during the 1950s. It was primarily used by the United States Army for reconnaissance, artillery spotting, and forward air control during the Vietnam War. The aircraft features a high-wing design and a tandem seating arrangement, allowing for excellent visibility. Powered by a single-engine, the O-1 Bird Dog is known for its reliability and versatility. It can operate from short and unpaved airstrips, making it suitable for various missions in challenging environments. Its simple design and ease of maintenance contributed to its long service life in military operations.