There's an almost identical little trick in Ultimates 2, where we get similar shots of Cap and one of the Liberators - the theme running through Ultimates about Captain America's genetic legacy is one of the interesting things about it. IIRC, Cap is the only person resulting from the Project Rebirth experiments who isn't either mentally unstable or full-on sociopathic. All these here, the Hulk, Red Skull, Fury, the Soviet attempts at supersoldiers, Nuke.