Mystic Gash
You have to hold up The End for the camo, I know this as fact, but I don't know how to force him to drop it. I tranqued him to zero stamina and all I got was his gun
strange...
but to hold him up... you have to sneak up behind him using the d-pad...
use your thermal goggles to track his footprints and once you're behind him, pull out your m37 and aim it at him.. snake should say freeze and the end should lay down... now, switch to your mk-22 and fire a shot close to his head... do this three times and he should shake out his camo... then just pop him one in the head with either the mk or the m37...
there's also two more ways to beat him...
one is by starting the boss fight, saving, moving you ps2 clock forward a week and then turning the game back on... you get a nice cutscene