I found this out while reading about the game's secrets...
You know how you get those emblems at the end? And how you were talking about playing the game on Big Boss Extreme and it was impossible? Well there's a Big Boss Emblem.
But to get it you have to:
"Successfully complete the game on The Boss Exteme, using no continues, getting no Alert Phases, killing no enemies, using no Rations/Regain/Noodles, the stealth camo, or the Bandana, and have a completion time of five hours or less. For acquiring this Emblem you are also rewarded the Patriot, the Big Boss FaceCamo, and the Big Boss iPod Song."
!
You know how you get those emblems at the end? And how you were talking about playing the game on Big Boss Extreme and it was impossible? Well there's a Big Boss Emblem.
But to get it you have to:
"Successfully complete the game on The Boss Exteme, using no continues, getting no Alert Phases, killing no enemies, using no Rations/Regain/Noodles, the stealth camo, or the Bandana, and have a completion time of five hours or less. For acquiring this Emblem you are also rewarded the Patriot, the Big Boss FaceCamo, and the Big Boss iPod Song."
!