Build your army and fight for peace in Metal Gear Solid: Peace Walker for the PSP. Set after Portable Ops, follow Naked Snake (Big Boss) as he establishes Militaires Sans Frontières (Soldiers Without Borders). Experience a deep single-player campaign, recruit soldiers, develop new weapons and technology at Mother Base, and engage in thrilling cooperative multiplayer missions. This ambitious title offers a console-quality Metal Gear experience on the go.