On September 24, 2015 at 01:00 MSK (22:00 September 23, 2015 UTC) the Space Forces conducted a successful launch of a Rockot space launcher with Briz-KM booster stage from the launch pad No. 3 of the launch complex No. 133 of the Plesetsk test site. The three spacecraft delivered into orbit are military communication satellites of the Strela-3M/Rodnik type.
The satellites received designations Cosmos-2507, Cosmos-2508, and Cosmos-2509 and international designations 2015-050A, 2015-050B, and 2015-050C. They are registered by NORAD as 40920, 40921, and 40922.
Previous launch of Rodnik-type satellites took place in May 2014. It also used the Rockot launcher, which is a converted UR-100NUTTH ICBM.
In the past, launches of the Rodnik-type satellites also delivered into orbit a small payload, unannounced at the time of the launch.