Use a metal pick or allen wrench. 
Also can get that crunch effect with a flanger set on medium regen.
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|-2-3-2-3-2-0-(rest)--2-3-2-3-2-0-|
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repeat through song listen to CD for when its played and not played
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|-2-3-2-3-2-0-(rest)--2-3-2-3-2-0-|
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|-5-quarter-bend-7r-5-------------|
Play above when Zach says
(Troops strippin' zoots, shots of red mist)

Final Riff
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|-2-3-2-3-2-3-2-3-2-3-2-3-1-3-----|