Commercial Resupply Services (CRS) are a group of contracts given by NASA from 2008 to 2016 for delivery of cargo and supplies to the ISS on commercially operated spacecraft. The first CRS contracts were signed in 2008 and gave $1.6 billion to SpaceX for 12 cargo sending missions, covering deliveries to 2016. SpaceX CRS-1, the first of the 12 planned resupply missions, launched in October 2012, achieved orbit, connected to and remained on station for 20 days, before re-entering the atmosphere and splashing down in the Pacific Ocean. CRS missions have flown about twice a year to the ISS since then. In 2015, NASA extended the Phase 1 contracts by ordering three more resupply flights from SpaceX. After further extensions late in 2015, SpaceX is to fly a total of 20 missions. A second group of contracts (known as CRS2) were proposed in 2014. They were given in January 2016, for cargo transport flights beginning in 2019 and expected to last through 2024.
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