The Peregrine Falcon Squad (also known as the PF Squad or the Regular Army) are an elite soldier squadron and one of the main protagonist groups in the Metal Slug series. In Mushroom Kingdom Fusion, they are located in World 2: Alternate Earth and assist the Mushroom Kingdom Coalition in their mission to foil General Morden and the Rebel Army's plans of taking over the world. Members of the Peregrine Falcon Squad appear as NPCs in some levels either to give the player tips or to occasionally assist them in battle against certain bosses.