Captain America's shield
Captain America's shield is a shield made of vibranium that was wielded by Steve Rogers, the first Captain America. Often seen as a symbolic and physical representation of the Captain America mantle, it has been transferred to several other people.
Following the destruction of Captain America's USO shield during a liberation mission, Howard Stark presented Rogers with an improved variation of the shield. The shield would be left untouched following the crash landing of the Valkyrie in 1945, until 2011, when a S.H.I.E.L.D. team discovered the wreckage of the Valkyrie and recovered the shield and Rogers. Rogers would use the shield for various wars and battles, until it was ultimately destroyed by Thanos during the battle of Earth. Rogers would use the Quantum Realm to reunite with Peggy Carter, passing a shield from an alternate universe down to Sam Wilson.
Wilson would retain the shield until ultimately donating the shield to the Smithsonian Institution. The United States Department of Defense would retrieve the shield from the Smithsonian, passing it and the Captain America title down to John Walker. The shield attracted international attention following Walker's use of the shield to kill Nico, a Flag Smasher who had accidentally slain Lemar Hoskins, Walker's partner. Wilson and Bucky Barnes would battle Walker for the shield, with Wilson reclaiming the mantle and the shield following the battle and Walker's discharge.