The Soyuz-U launch vehicle is an improved version of the original Soyuz LV. Soyuz-U is part of the R-7 family of rockets based on the R-7 Semyorka missile. Members of this rocket family were designed by the TsSKB design bureau and constructed at the Progress Factory in Samara, Russia.
Soyuz-MS-03 will transport three members of the Expedition 50 crew to the International Space Station. MS-03 will be the 132nd flight of a Soyuz spacecraft. The crew will consist of a Russian commander and an American and European flight engineer, as well.