sentences:  It was reformed on 4 April 1968 in Poland, and was active there with the Northern Group of Forces for over twenty years, shifting to the North Caucasus Military District in August 1992.The arrival of the Sukhoi Su-24 drastically changed its tasking in the 1980s.It became the 4th Air and Air Defence Forces Command in 2009 but was reestablished from the command in 2015.