GRU (ГРУ) or Glavnoye Razvedyvatel'noye Upravleniye (Главное Разведывательное Управление - Main Intelligence Directorate) is a Russian military intelligence agency subordinate to the Joint Chiefs of Staff (GenShtab) and the Ministry of Defence, as opposed to, consecutively, CheKa, NKVD, KGB, FSB and FSB's foreign division SVR, all non-military. It was formed just before the end of the First World War. The agency continued to exist throughout the turbulent times surrounding the Red Revolution, and remains in service to Russia today.
GRU is a playable faction during the campaign of Battlefield 3. Unlike the other factions, it is comprised entirely of three named characters: the playable character, Dimitri Mayakovsky, and his squadmates Kiril and Vladimir Kamarivsky.
They are playable during the mission Comrades, where they attempt to stop Solomon's subordinates from detonating a nuclear bomb in Paris, as well as during Kaffarov, chronologically prior to Comrades, where they capture Amir Kaffarov and learn of the bomb plot. Vladimir is killed during Comrades due to shrapnel, while Dimitri and Kiril likely contract radiation poisoning stemming from the nuclear explosion.