Probably a renewed hope in the US thanks to Cap.
Also when Hammer Industries got the Mark 2, they named it "War Machine" Not something the Air force probably wants for PR purposes.
So out comes the "Iron Patriot". It's basically an armored version of Captain America the air force can use for PR and special missions
Now I want to see Iron Patriot do a song and dance :P
Every bond you buy is a bullet in the barrel of your best guy's gun!