The mixing of visual metaphors is, of course, nifty--the Iwo Jima picture and the American Flag. But it's the alteration of those metaphors that's so cool. Turning the flag into a bar code--a bar code printed, it seems, in blood. Turning the American Flag, for which those Marines fought (supposedly), into the Jolly Roger. On a technical level, I love how the organic curves of the Iwo Jima sillhouette contrast with the straight horizontal lines of the flag. Does the bar code have any significance? Finally, I like the way the bar code seems lit from behind with the most powerful light source in the center. It makes the picture "pop" more.
I'm a word guy more than a picture guy . . . I'm not so sure I'd use that tagline, "We dream of ways to break these iron bars." That's more cliché. They aren't iron bars--they're bars of blood (that's why they're red). So if you said "We dream of ways to break these bars of blood," that would be better. Not great, but better. I think even better is "Fighting to Defend the Stars and Stripes of Blood" or something. But why do you need a tagline?