ResumePlay's Jack Patton writes: "Announced in the wake of Metal Gear Solid: Rising, Peace Walker is the canonical sequel to PSP's Portable Ops. It moves on four years from the events at the San Hieronymo Peninsula to 1974. Now more grizzly than ever, Big Boss is in Costa Rica as the head of a mercenary group called 'Militaires Sans Frontières'. A french translation of 'Military without borders'. As Costa Rica had no military at the time, it was seen as easy pickings. An uknown military power takes over, and it's up to Big Boss to save the day."