The tattoo on the dude arm is from old Thai cultures monk tattoos. They are believed to be magical and sacred! They were done as protections for soldiers from enemies and bad spirits. Try google around with "Sak Yant"
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Sak Yant Thai Temple Tattoos | Sak Yant Buddhist Temple Tattoos, Sacred Yantra made by Buddhist monks, Brahmin Masters and Ruesi Sages, Kata Khom, Magic Amulets