Okay, I'm not sure if this has been discussed before, but oh well.
We all know of the song "Heavens Divide" from Metal Gear Solid: Peace Walker, but I just recently listed to the lyrics more closely. More specifically, this part:
When heavens divide
Time will come to softly lay me down
Then I can see her face that I long to see
When you think about it for a minute, it sounds like the song, or at least that part, is from Big Boss' perspective. When you combine those lyrics with the fact that B.B. literally begged Strangelove to kill him during the torture sections, it sounds like he wants to die so he can see the Boss again.