A Boeing B-47 Stratojet banks sharply through the upper atmosphere, its six turbojet engines carving four parallel contrails against a darkened sky. Entering service in 1951, the swept-wing B-47 gave the Strategic Air Command its first true jet-powered medium bomber, capable of delivering nuclear payloads at high speed and altitude during the tense early decades of the Cold War. Its innovative bicycle landing gear and flexible, high-aspect-ratio wings influenced the design of jet aircraft for a generation. Project: 218215