|Mission type||Crewed mission to ISS|
|Mission duration||6 Months|
|Start of mission|
|Launch date||NET 2021/2022|
USCV-4 (US Crew Vehicle-4) will be the fourth operational crewed flight of a US commercial spacecraft onboard either a SpaceX Dragon 2 or a Boeing CST-100 Starliner. The mission will resupply four astronauts and cargo to the International Space Station The mission will last and be docked to the ISS for 6 months. Little is known about this mission due to it being scheduled to launch six months after USCV-3 which itself is scheduled to launch sometime in 2021.
- "Commercial Crew Program - Essentials". 14 August 2019. https://www.nasa.gov/content/commercial-crew-program-the-essentials.
- Bayt, Rob (July 26, 2011). "Commercial Crew Program: Key Driving Requirements Walkthrough". NASA. Archived from the original on March 28, 2012. Retrieved May 8, 2020. https://web.archive.org/web/20120328055242/http://commercialcrew.nasa.gov/document_file_get.cfm?docid=107
- "Commercial Crew Program – fact sheet". https://www.nasa.gov/pdf/660622main_2012.06.18_CCP.pdfwebsite=NASA.
- "Commercial Crew Transportation Capability (CCtCap)". https://www.nasa.gov/sites/default/files/files/CCtCAP-Attachment-J-03.pdf.