Board Thread:General Discussion/@comment-65.31.134.55-20130328025957/@comment-1672596-20130329115317

I'm not sure if the arm was lost at Mother Base. Big Boss still clearly had the arm when boarding the chopper, and while in the chopper. He also sustained scars that weren't present when fighting the soldiers at Mother Base, so I assume it occured afterwards. If I recall correctly, there was also a Fox Engine still that had Big Boss fighting some sort of vehicle in a desert, and close inspection shows he still retained his left forearm. Most likely, he lost it while trying to fight XOF at some other location.

And the horn obviously had to have been removed by MG or MG2 or even MGS4, seeing how it is not present in either of those instances.

As far as the goggles, he most likely needed them for biking.