Metal Gear Solid: Portable Ops delivers the seriesť trademark stealth action to the PSP system while introducing several new elements that add even more depth and variety to Big Bossť latest mission. As players progress through the single-player campaign of Metal Gear Solid: Portable Ops, they will be able to recruit comrades to create an original fighting force. In addition to enemy soldiers, players can also recruit unique and rare non-player characters (NPCs) depending on their action in certain situations, building an armed force suited to their personal style of play. Each character will have a unique rating based on a sequence of personal attributes. Depending on the rating of the character, they will either excel or be deficient in a variety of combat skills, giving the player the ability to outfit their squadron with characters that fit the need of each particular situation.