As the leader of Diamond Dogs, your mission is to exact revenge on those who wronged you and to rebuild your military. You'll have to make tough decisions, form alliances, and confront your enemies head-on.

Throughout your journey, you'll encounter numerous challenges, from battling against rival mercenary groups to infiltrating heavily guarded facilities. You'll have to use your wits, your skills, and your arsenal of advanced technology to overcome obstacles and achieve your objectives.

As you regain your strength, you're approached by a woman named Quiet, a skilled sniper and your future ally. She informs you that you've been in a coma for nine years and that the world has changed dramatically. Your former ally, Big Boss, has been presumed dead, and his legacy has been all but forgotten.

Your journey begins in the deserts of Afghanistan, where you've been transported by a group of mysterious individuals. Your goal is to rebuild your military and uncover the truth about your past. You're armed with a prosthetic arm, a souvenir from your time in a Soviet gulag, and a burning desire for revenge.