On March 31, 2015 at 13:47 UTC the “Rockot” rocket-carrier was launched from Plesetsk Cosmodrome, Arkhangelsk region, North Russia. The launch was performed by Russian Aerospace Defence Forces. The rocket equipped with the “Briz-KM” booster (upper stage) orbited 3 “Gonets M” communications satellites and the “Kosmos-2504” military satellite. It was the 23^rd launch of a Rockot rocket-carrier since 2000.