Soviet Air Defence Forces

The Soviet Air Defence Forces (Russian: войска ПВО, romanized: voyska protivovozdushnoy oborony, V-PVO, lit. 'Anti-Air Defence Troops'; formerly: противовоздушная оборона страны, ПВО страны, romanized: protivovozdushnaya oborona strany, PVO strany, lit. 'Anti-Air Defence of the Country') was the air defence branch of the Soviet Armed Forces. Formed in 1941, it continued being a service branch of the Russian Armed Forces after 1991 until it was merged into the Air Force in 1998.

Source: Wikipedia — Soviet Air Defence Forces (CC BY-SA 4.0)