Center 2011 Russian: Центр 2011, romanized: Tsentr 2011 was a military exercise carried out by Russia and other ODKB forces in September 19 – September 27, 2011. Full name: Operational-strategic exercise Tsentr-2011. It involved 12,000 personnel, hundreds of armored vehicles, 50 aircraft and helicopters, and the Caspian Flotilla.