To get the bandana,do not submit to the
torture test,and at the end Meryl will
still live and instead of Otacon with you it will be Meryl,then she will show you the bandana.
To get stealth camoflauge,submit to the torture test, at the end Meryl will die,but later Otacon
gives you the stealth.
No matter what you do,if you continue the game you will return to the dock and have your prize.
(THE BANDANA GIVES YOU INFINITE AMMO/GRENADES)