Silver Centurion Iron Man: This armor was originally created by Tony Stark as a means to experiment and work out new ideas with his armor technology. The Centurion armor's "field-test" was against Obadiah Stane - with all of Tony's friends, business and his very life at stake. The defeat of Stane brought about a renaissance for Tony and Stark Industries.
Crimson Dynamo: Originally created as part of the Alpha Generation Soviet Super Soldiers, Crimson Dynamo was placed in cryogenic stasis, and was awakened following the detection of a nuclear detonation. In the battle that followed his awakening, the Dynamo was assumed to be a casualty.