HMAS Melbourne was the Royal Australian Navy's last aircraft carrier (to date).
The YB-35 and YB-49 were flying-wing bomber prototypes built during and in the wake of the Second World War.
One of the desiderata of an air defence system is to put defending fighters close to the high-value targets. That way they don't get decoyed away by diversionary attacks, giving the enemy bombers a clear run, because they're dedicated to protecting a specific target; nor do they need massive endurance (adding to weight), if they don't need to make long-distance flights.
One of the great scars on the American military-aviation psyche was the unescorted bomber. As the men who'd been on the front lines during the Second World War became the leaders of the Air Force, they tried to do something about it.
The Peacemaker was the world's first intercontinental bomber, and the largest mass-produced piston-engined aircraft ever built.