プログレスM-21M
クルス-NA試験の映像
最終ドッキング解除後
1 2 Progress M-21M launched to ISS
↑ Progress M-21M tested docking system
↑ <Progress M-21M docked with the ISS in the manual regime
↑ Russian Progress Spacecraft Boosts ISS Orbit, space-travel.com, 18 March 2014, accessed 19 March 2014
↑ “Russian Space Freighter Completes Tests, Redocks to Zvezda”. NASA. 2014年7月16日閲覧。