NASA Seeks ISS Resupply Concepts
NASA JSC Solicitation: Commercial Orbital Transportation Services (COTS) Space Flight Demonstrations
“The objective of these space flight capability demonstrations is to stimulate commercial enterprises in space and lead to innovative, cost effective access to low-Earth orbit. It is anticipated that upon the successful demonstration of any one of the mission capabilities prior to 2010 timeframe, NASA may issue a request for proposals to competitively procure commercial orbital transportation services to resupply the International Space Station. NASA anticipates that these services will be needed through at least 2015.”