by Zemo was eventually passed on to Elijah Bradley, the teenage hero known as the Patriot and leader of the Young Avengers. Revised history In 2010, the history of the original shield was revised. In the limited series Captain America/Black Panther: Flags of Our Fathers, Captain America, Sergeant Nick Fury and the Howling Commandos meet Azzari (grandfather of T'Challa)—the Black Panther and king of Wakanda during World War II. Aided by Wakandan military forces, they repel a series of Nazi attacks led by the Red Skull and Baron Strucker. During the battle, the Red Skull (wearing a battle-suit) crushes the triangular shield, and Captain America uses a circular vibranium shield provided by T'Challa to incapacitate the Skull. The weapon serves as the inspiration for the circular shield that the super-soldier begins using upon his return to America, and the encounter marks the beginning of friendly relations between the United States and Wakanda. Circular shield The round shield most associated with Captain America made its debut in Captain America Comics #2 (April 1941). An indestructible concavo-convex metal disc approximately in diameter, weighing , it has remained Captain America's most constant shield over the decades. In Captain America #255 (March 1981), it is established that the shield was presented to Rogers by President Franklin D. Roosevelt. The shield is created by fictional American metallurgist Myron MacLain, who had been commissioned by the US government to create an indestructible armor material to aid the war effort. MacLain experiments with vibranium. During one of his experiments to fuse vibranium with an experimental steel alloy, MacLain falls asleep and awakens to find that the resulting alloy had set in a tank hatch mold. However, he was not able to duplicate it, because as MacLain described it, "some unknown factor" was present during the experiment that he could not identify. The shield was then painted to become Captain America's weapon and symbol. MacLain would later attempt to recreate the shield's metal to no avail, his experiments instead eventually yielding the super-metal adamantium. While adamantium has been portrayed as practically indestructable, MacLain said was "no match" for the mysterious Vibranium/Proto-Adamantium shield. Rogers' shield is more durable than regular adamantium and is essentially indestructible. The vibranium grants the shield unusual properties, allowing it to absorb all of the kinetic impact and vibrations from any blows that the shield receives without injuring Rogers in the process. The vibranium is