"Metal Gear Solid: Portable Ops (メタルギアソリッド ポータブルオプス, Metaru Gia Soriddo Potaburu Opusu?) (commonly abbreviated to MPO) is a stealth game directed by Masahiro Yamamoto and written by Gakuto Mikumo, with series creator Hideo Kojima acting as a producer.[1] Portable Ops was developed by Kojima Productions and published by Konami in 2006 for the PlayStation Portable.[2] It is the third Metal Gear title for the PSP and the first one to retain the series' action-based gameplay.[3] It is also the first canonical outing of the Metal Gear Solid series for a portable platform, following the storyline of Metal Gear Solid 3: Snake Eater.[4]
Set in 1970 in South America, six years after the events of Snake Eater, the game follows the exploits of Naked Snake after his former unit, FOX, goes renegade. [3] The game also chronicles the eventual founding of FOXHOUND and The Patriots, as well as the inspiration of the military state Outer Heaven.[5][3]"
Source: Wikipedia, "Metal_Gear_Solid:_Portable_Ops," available under the CC-BY-SA License.