NASA's Commercial Orbital Transportation Services (COTS) program (2006–2013)
NASA Administrator Mike Griffin launched COTS as a public-private partnership, offering $500 million in milestone-based payments to companies that could develop cargo vehicles for the ISS. SpaceX and Rocketplane Kistler won initial awards; Kistler defaulted and was replaced by Orbital Sciences. Both remaining companies successfully demonstrated cargo delivery by 2013.
NASA gained two independent commercial cargo providers at a fraction of the cost of developing a government vehicle, with SpaceX's Dragon reaching the ISS in May 2012 and Orbital's Cygnus following in September 2013.
COTS became the template for NASA's commercial partnerships, directly leading to the Commercial Crew Program that now flies astronauts on SpaceX Crew Dragon. The model proved that fixed-price, milestone-based contracts could deliver spaceflight capability faster and cheaper than traditional cost-plus procurement.
CRS-24 is a direct descendant of COTS — the same Cygnus vehicle lineage, now enlarged to XL size and flying on a different rocket, continuing a supply chain that COTS created 20 years ago.
