that the government should purchase commercially available space goods and services to the fullest extent feasible and shall not conduct activities with potential commercial applications that preclude or deter Commercial Sector space activities except for national security or public safety reasons. On 5 November 1990, United States President George H. W. Bush signed into law the Launch Services Purchase Act. The Act, in a complete reversal of the earlier Space Shuttle monopoly, ordered NASA to purchase launch services for its primary payloads from commercial providers whenever such services are required in the course of its activities. In 1996, the United States government selected Lockheed Martin and Boeing to each develop Evolved Expendable Launch Vehicles (EELV) to compete for launch contracts and provide assured access to space. The government's acquisition strategy relied on the strong commercial viability of both vehicles to lower unit costs. This anticipated market demand did not materialise, but both the Delta IV and Atlas V EELVs remain in active service. Commercial launches outnumbered government launches at the Eastern Range in 1997. The Commercial Space Act was passed in 1998 and implements many of the provisions of the Launch Services Purchase Act of 1990. Nonetheless, until 2004 NASA kept private space flight effectively illegal. But that year, the Commercial Space Launch Amendments Act of 2004 required that NASA and the Federal Aviation Administration legalise private space flight. The 2004 Act also specified a "learning period" which restricted the ability of the FAA to enact regulations regarding the safety of people who might actually fly on commercial spacecraft through 2012, ostensibly because spaceflight participants would share the risk of flight through informed consent procedures of human spaceflight risks, while requiring the launch provider to be legally liable for potential losses to uninvolved persons and structures. To the end of 2014, commercial passenger flights in space has remained effectively illegal, as the FAA has refused to give a commercial operator's license to any private space company. The United States updated US commercial space legislation with the passage of the SPACE Act of 2015 in November 2015. The full name of the act is Spurring Private Aerospace Competitiveness and Entrepreneurship Act of 2015 The update US law explicitly allows "US citizens to engage in the commercial exploration and exploitation of 'space resources' [including... water and minerals]". The right does not extend to biological life, so anything that is alive may not