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ar-15 assault_rifle black_and_white clothing cutie_mark drill_sergeant duo equid equine feral friendship_is_magic gun hasbro hat headgear headwear hi_res holding_gun holding_object holding_ranged_weapon holding_weapon horn horse m16 male mammal military monochrome muscular muscular_feral muscular_male my_little_pony mythological_creature mythological_equine mythology parody pony quadruped ranged_weapon rifle simple_background tail unicorn unknown_artist vietnam vietnam_war weapon white_background yelling