The Rusty & Greasy Manufacturing Experimental Bomber/Attacker 1, prototype name Valkyrie, was a fast attack heavy bomber being developed during the late stages of the Equestria/Zebra empire conflict, designed to fill the role as a response to increased use of Zebra dragon aerial strikes. The twin Ministry of Wartime Technology 40mm automatic cannons located in the cheeks either side of the cockpit carry 160 rounds between them in 40 round clips, which can be reloaded mid-air and consist of a mix of High-velocity armor-piercing High Explosive, High Explosive White Phosphorous, and High Explosive Tracer shells. The Valkyrie comes equipped with two twin tesla cannon turrets mounted aft of the cockpit windshield and beneath the turbine exhausts aft of the bomb bay. The Valkyrie is capable of carrying a conventional or self-contained megaspell payload of up to 5000 kilograms, and with the advanced fire control systems can switch between bombing, ground-strafing, and gunshipping roles without fuss. One fully-functional prototype has been constructed and has conducted test flights from Sunrise Castle Air Base located to the north of the town of Steel Creek; it is expected that the bomber will enter full production in 2080.