I went through a massive Metallica phase in high school. Metal Militia is a song from their first major recording, 'Kill 'em All.' I used to play that song before all my soccer games so my teammates would usually call me 'Metal' or 'Militia.' It eventually became the team's unofficial name, we even had warm-up jerseys made with "Metal Militia" printed where our names would normally be...
The SRT that follows is... well, i think you'll figure it out.