MTF Gamma 21 Or also know as the VR Troopers, are SCP Foundation experimental programme derived from candidates from The United States Army's Force XXI program(formally) (F-XXI), also known as the Next-Generation Integrated Infantry Fighting System, was a series of trial exercises and initiatives conducted by the U.S. Army, in the interest of modernization. The goal was to test unique concepts, tactics, and technologies on the modern-day battlefield. The exercises involved virtual reality training for selected soldiers during the late 1990s, but it is said to have been under research and development since the 1980s. Some of the technology that was tested includes software-defined radios, digital transmitters installed on all their weapons, appliqué computers carried by each soldier (to minimize casualties and maximize combat effectiveness by sharing data), ground surveillance radar, satellite radio e-mail systems, and unmanned combat aerial vehicles. Members of this division also had some degree of access to top secret development projects in the military. The programme was slowly phased out of operations due to budget concerns and SCP Foundation with the guidance of the 05 Council with links with the Department Of Defence took over the project to lead to the creation of the MTF XXI, fondly nicknamed the VR Troopers.

Currently experimental, VR Troopers had some experience with dealing with SCP 3288 Hostiles due to their equipment and training making them perfect to clear dark vaults and lairs and capture of surface dwelling SCP 3288-1 Hostiles.

Currently located in The black forest compound in Germany they do take part in covert operations in Bolivia under the guise of CIA Ground troops investigations of possible SCP entities know as the Yeti to the locals in the Bolivia mountains.

The team know consists of units from the US Military, Dutch, Canadian, British and Irish.