In Iron Man 2, the Hall of Armor is shown several times in the background during the film. At this point, it houses the Mark I armor that was collected by the Ten Rings and housed in Stark Industries for some time], the Mark II prototype armor, the Mark III armor that was damaged during his battle with Stane and the explosion of the Arc Reactor, and his current Mark IV armor. The Mark V "briefcase" armor did not have a spot here.
During Stark's birthday party, James Rhodes entered the Hall and took the Mark II armor, along with a spare mini-arc reactor. After a brief skirmish with Stark, Rhodes stole the armor and it was used as a basis for the War Machine.
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