; (B) flight opportunities for those payloads to microgravity environments and suborbital altitudes; and (C) transition of those payloads to orbital opportunities. (2) Commercial reusable vehicle flights In carrying out the Commercial Reusable Suborbital Research Program, the Administrator may fund engineering and integration demonstrations, proofs of concept, and educational experiments for flights of commercial reusable vehicles. (3) Commercial suborbital launch vehicles In carrying out the Commercial Reusable Suborbital Research Program, the Administrator may not fund the development of commercial suborbital launch vehicles. (4) Working with mission directorates In carrying out the Commercial Reusable Suborbital Research Program, the Administrator shall work with the mission directorates of NASA to achieve the research, technology, and education goals of NASA. . (c) Conforming amendment Section 907(b) of the National Aeronautics and Space Administration Authorization Act of 2010 ( 42 U.S.C. 18405(b) ) is amended, in the first sentence, by striking Commercial Reusable Suborbital Research Program in and inserting Commercial Reusable Suborbital Research Program established under subsection (c)(1) within . 503. Small Spacecraft Technology Program (a) Sense of Congress It is the sense of Congress that the Small Spacecraft Technology Program is important for conducting science and technology validation for— (1) short- and long-duration missions in low-Earth orbit; and (2) deep space missions. (b) Accommodation of certain payloads In carrying out the Small Spacecraft Technology Program, the Administrator shall, as the mission risk posture and technology development objectives allow, accommodate science payloads that further the goal of long-term human exploration to the Moon and Mars. 504. Nuclear propulsion technology (a) Sense of Congress It is the sense of Congress that nuclear propulsion is critical to the development of advanced spacecraft for civilian and national defense purposes. (b) Development