How this new stealth plane keeps the US ahead of China. The United States just unveiled its newest stealth bomber, the B-21 Raider. It completed its first test flight in November 2023 after more than 10 years of research and development. Much remains classified, but it's safe to say this will be one of the most advanced pieces of technology ever made. Its most important characteristic is stealth. The US claims that it can evade even the most advanced air-defense systems on earth – hence why it’s currently costing about $700 million to build one of them. This video explains why the US believes the money is not only worth it … but a national security imperative.