NASA gave SpaceX a Commercial Resupply Services contract to launch Falcon 9s with Dragon capsules to the ISS. Now SpaceX is trying to human-rate the Falcon 9 so that SpaceX can launch crews to the ISS in this year. The first version of the Falcon 9 flew in 4 June 2010. The latest version, Block 5, was introduced in 15 May 2018 with increased engine power and other changes to help recovery and reuse.