Captain America - Two Americas (2010)

Collects Captain America Reborn: Who Will Wield The Shield? & Captain America (2004-2011) 602-605.
Who will wield the shield? Will it be Steve Rogers or Bucky Barnes who carries the iconic shield of America's Sentinel of Liberty? That decision better be made quickly, as the insane Cap from the 1950s is on the loose and jeopardizing America's security from the inside.