On February 22, 2021, the American "Cygnus” CRS-15 (NG-15, the S. S. Katherine Johnson) private unmanned supply spacecraft was docked to the International Space Station (ISS). The Cygnus spacecraft was grappled by a robotic arm at 09:38 UTC. The cargo spacecraft was docked to the station’s "Unity” module at 12:16 UTC. The spacecraft delivered about 3700 kilograms of supplies to the Space Station. It was the 15^th docking of a "Cygnus” spacecraft with the ISS. This is the 4^th flight of Cygnus under the CRS-2 contract.