Board Thread:General Discussion/@comment-65.31.134.55-20130328025957/@comment-6747658-20130329065940

Well the goggles may well be just coincidental. EVA's goggles are motorcyclist goggles, usually worn with an helmet that has the face exposed. I can only imagine Big Boss wears them for similar reasons.

The arm, I can only assume he lost it in the fall of the Motherbase, I mean he was pretty banged up if he went into cardiac arrest and they needed to difibrilate him in order to get him back alive albeit in coma. It's not unthinkable that his arm was messed up already when they got him into the hospital.

The horn...it is clearly something that occurs between the hospital scene and Big Boss on a bike scene, which is arguably days/weeks later. I personally still think it is something similar to a rock sticking in his head. Sometimes, hostile projectiles that entered/got stuck in the head were kept in place due to risk of creating more damage upon removal. In the trailer Big Boss and Ocelot seemingly get nearly blown up with lightning, and rocks are flying around, we don't get to see Big Boss' face again after that scene.