America's Army: Proving Grounds

"Set in the fictional Republic of the Ostregals, players assume the role of an 11B Infantryman practicing combat maneuvers at Joint Training Center Griffin (aka The Proving Grounds), a MOUT (Military Operations on Urban Terrain) training environment quickly assembled using existing building infrastructure, Conex shipping containers and local materials. This training is crucial to the player's success as part of the Long Range Combined Arms – Recon (LRCA-R) team, a full spectrum capable unit for doing special operations missions deep behind enemy lines."

Source: Wikipedia, "America's_Army," available under the CC-BY-SA License.