Lyric discussion by stayfluffy 

Branching off from what Mozared said, I think this song is solely about war; and not the state of the world. I think the chorus can be pretty much translated as follows:

"No they won't miss you when you're gone. When your heart stops beating and pumping blood.": If you die in combat, you're just a number that will get replaced by another number. Which is only partially true that they won't miss you, because the family and all of the soldiers that knew them will miss you. But anyone higher than that like the generals and the president won't care. They can't, really.

"Pull the pin. Light the fuse." That can either be about a soldier, committing himself to combat. Which is the harsh way of going about it. Or, it's about the next line after that...

"This song's the smartest bomb." The (pull the pin light the fuse) line might be about this song being the smartest bomb, going off. And I think they mean it's the smartest bomb because SHABOOM! It goes off and you don't die :D You just get a little bit more compassionate.

The "You're so in control. You're so disposable." Part could either supposed to be told to two different people, or to the same person. Assuming it's to two different people, it probably means something along the lines of:

You're so in control: Referring to the president/secretary of defense/generals who send the troops out. And the (you're so disposable) line would in return reference to the troops being disposable.

OR, if it is being told to the same person, it probably means something along the lines of:

A soldier getting the feeling that he is in control, he's fearless and unbeatable, part of the strongest military, all of that stuff. And then being told how disposable he is because he's just another number that can be thrown around (literally) pretty much anywhere in the world.

Anyways, I'm partially speaking out of ignorance here, but the US can't just stop going to war. As much as I hate that (and believe me I'm not at all trying to look like I'm supporting sending people out to kill and die) without the US going to fight, who would have helped end the dictatorship of Ghadafi? Who would be on the ground actively going after Kony? What would be the reason for North Korea to not attack South Korea? I'm sure there are more examples, but my point is, sometimes fighting and intimidation is necessary in a world where some people are still terrorists, some people are still motivated by manifest destiny, some people are still dictators.

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