This is an artist's conception of a United Launch Alliance rocket being considered for NASA's Commercial Crew Program.

This is an artist's conception of a United Launch Alliance (ULA) Atlas V rocket being considered for NASA's Commercial Crew Program (CCP). In 2011, NASA and ULA of Englewood, Colo., entered into an unfunded Space Act Agreement during Commercial Crew Development Round 2 (CCDev2) activities to mature the design and development of a crew transportation system with the overall goal of accelerating a United States-led capability to the International Space Station. The goal of CCP is to drive down the cost of space travel as well as open up space to more people than ever before by balancing industry’s own innovative capabilities with NASA's 50 years of human spaceflight experience. Six other aerospace companies also are maturing launch vehicle and spacecraft designs under CCDev2, including Alliant Techsystems Inc. (ATK), Blue Origin, The Boeing Co., Excalibur Almaz Inc., Sierra Nevada Corp., and Space Exploration Technologies (SpaceX). For more information, visit www.nasa.gov/commercialcrew. Image credit: United Launch Alliance