Once the "kill switch" has been turned on, it doesn't turned off. Is this what you want?" Now the character is out of the combat zone, back state-side, but all he has is a messed up psyche. Purple heart could also mean a literal heart that is in poor health. military members receive for being wounded in combat. The purple heart is a medal that the U.S. "I've tried to tell you, but your purple hearts are giving out." The part about the purple hearts seems to have more than one meaning. "Fake anti-fascist lie." The lie based off of the poor intelligence that caused us to invade in the first place.
The chorus of the song refers to the overall corruption and death of a generation as a result of this war. However, his psyche has been corrupted by what he has seen and done. "I'm done! It has begun, I'm not the only one." The character is at his breaking point, he's fed up with the system as a whole. It's still not a lot, but compared to state-side, it's a small fortune. "Then fill your mouth with all the money you will save." While on deployment, troops make a lot more than back in the states. "Go drill your deserts, go fill your graves" Pretty self explanatory.
"I did my time and I want out." The character is referring that he did his required time, either in Iraq, or in the military as a whole and wants out. My InterpretationThis might have something to do with me being an Iraq War veteran, but I see it as an anti-war song. Just look me in the eyes and say I'm wrong Then fill your mouth with all the money you will save