During the Cold War, the U.S. Air Force tested a jet so secret, so strange-looking, and so ahead of its time, that most people still don’t believe it was real.Meet Tacit Blue — Northrop’s bizarre box-shaped stealth aircraft that looked like a flying brick… but could vanish from radar. Designed under DARPA’s black-budget “Project Harvey,” this experimental jet was a critical stepping stone in America’s stealth revolution, laying the groundwork for the B-2 Spirit and modern low-observable aircraft.In this video, we dive deep into the forgotten story of the Tacit Blue: how it was designed, what made it so revolutionary, and why it disappeared for over a decade before being declassified.From curved surfaces that confused enemy radar to groundbreaking sensors that let it track targets while staying invisible, Tacit Blue wasn’t just a prototype—it was proof that stealth technology could work in daylight, at low altitudes, and in enemy airspace.This is the true story of the weirdest, most important jet you’ve never heard of.