Character: "Raiden" / Jack
Chapter 18: Going Loud With Snake & Destroying Hordes Of Metal Ray

The game is going to be more action rather than stealthy from here, with Snake & Raiden going loud and killing everyone. Take note Snake can die easily here, so protect him at all cost. Use the sword against those sword enemies as guns will deflect bullets shot by both Snake & Raiden.
After that, its time to fight with hordes of Metal Ray. This part can be tricky, but just focus on shooting the head of each Metal Ray first. It will be hard so shoot the legs to make it handicap for a while before aiming for the head as only the head will deal damage to it. This is more of a survival till time runs out and cutscene appears so try to keep yourself alive, and do not shy away from using rations as and when necessary. Here's the chapter that I feel I need to depend on it. After all the game is reaching its end.

Playlist: https://dailymotion.com/playlist/x73944