The M-21 is a military aircraft developed by the Soviet Union during the Cold War. It is a variant of the M-17 helicopter, designed for reconnaissance and light attack missions. The M-21 features advanced avionics and can carry various weapons, making it versatile for different combat scenarios. This aircraft is notable for its ability to operate in diverse environments, including urban and rural settings. The M-21 has been used by several countries and has undergone various upgrades to enhance its performance and capabilities, ensuring its relevance in modern military operations.