Current funding for the Gi21 program ended on September 30, 2008 and the information found in the program modules is up-to-date as of December 31, 2008. To facilitate use of the modules from now till the future continuation of the program, new documents can be posted from each module and sub-module main pages and the community discussions are open. However the main module pages and documents will not be updated. If you have any questions, please contact Kirsten Clark.
Aerospace activity is a cooperative between public and private entities and most countries (the United States included) have their space program under the control of a government agency. The National Aeronautics and Space Administration is the U.S. agency that oversees the nation's research, design, manufacture, operation and maintenance of air and space activities.