; (4) such credibility in budgetary estimates is an important factor in understanding program risk; (5) United States access to low-Earth orbit is paramount to the continued success of the ISS and ISS National Laboratory; (6) a stable and successful Commercial Resupply Services Program and Commercial Crew Program are critical to ensuring timely provisioning of the ISS and to reestablishing the capability to launch United States government astronauts from United States soil into orbit, ending reliance upon Russian transport of United States government astronauts to the ISS which has not been possible since the retirement of the Space Shuttle program in 2011; (7) NASA should build upon the success of the Commercial Orbital Transportation Services Program and Commercial Resupply Services Program that have allowed private sector companies to partner with NASA to deliver cargo and scientific experiments to the ISS since 2012; (8) the 21st Century Launch Complex Program has enabled significant modernization and infrastructure improvements at launch sites across the United States to support NASA's Commercial Resupply Services Program and other civil and commercial space flight missions; and (9) the 21st Century Launch Complex Program should be continued in a manner that leverages State and private investments to achieve the goals of that program. (c) Reaffirmation Congress reaffirms— (1) its commitment to the use of a commercially developed, private sector launch and delivery system to the ISS for crew missions as expressed in the National Aeronautics and Space Administration Authorization Act of 2005 ( Public Law 109–155 ; 119 Stat. 2895), the National Aeronautics and Space Administration Authorization Act of 2008 ( Public Law 110–422 ; 122 Stat. 4779), and the National Aeronautics and Space Administration Authorization Act of 2010 ( 42 U.S.C. 18301 et seq.)