Major parts of UAVs have traditionally been assembled from components made of molded plastic, but the development of Additive Fabrication presents the option of printing UAV parts instead: The National Aeronautics and Space Administration (NASA) is using Additive Fabrication Technology to develop UAV prototypes that may someday be used to explore the surface of Mars, and The Pentagon has developed an Additive Manufacturing Strategic Roadmap to get customized UAVs. Now, some new technologies and pending federal regulations are enabling the manufacture and use of UAVs in domestic commerce, giving rise to a growing commercial UAV industry.