[Steve can see that he's working it out, willing to give him as much time as he needs and answer whatever questions that follow to the best of his ability. He smiles softly to show that he understands the question, but it's also sad enough that it starts to answer for him.]

A world war, a lot of terrible things happening to good people. [Something that would make an artist put down his pencil and pick up a shield.] It's a long story. Basically I was a little guy, but the Army gave me one chance to fight for the little guy. [Which Steve obviously stopped being somewhere along the way, at least physically.] So I took it. And I went to war and we won.

[There's a heavy sigh after that, somewhat out of place. But everyone loses things during wars too, important things. It's hard to celebrate.]

Sounds like you must be pretty well trained.