Extravehicular Mobility Units (a) Replacement Suits The Administrator shall take all necessary steps to provide for upgraded and replacement International Space Station Extravehicular Mobility Units (EMUs), including spares, to ensure the safety of the International Space Station crew and crew operations. The upgraded and replacement units shall be fully tested and demonstrated, including on the ISS, to be certified by the Administration for use by crew as soon as practicable. Upgraded and replacement EMUs, including spares, shall accommodate the diversity of ISS crew, suit sizes, and other requirements established to support extravehicular activities. (b) Plan Not later than 180 days after the date of enactment of this Act, the Administrator shall transmit a plan for the provision of upgraded and replacement EMUs to the Committee on Science, Space, and Technology of the House of Representatives and the Committee on Commerce, Science, and Transportation of the Senate. 226. Low Earth orbit development (a) In General The Administrator shall carry out development activities in low Earth orbit for the purposes of meeting the requirements established in subsection (b) and of supporting basic space life and physical sciences research and applications, in accordance with the requirements identified in section 307, following the end of International Space Station operations. (b) Requirements for Low Earth Orbit Activities and Research in Support of Human Exploration The Administrator shall continue to develop and regularly update detailed research, development and associated requirements and capabilities that are needed to support NASA’s human spaceflight and Moon to Mars Program and that must be carried out in low Earth orbit. Requirements and capabilities for NASA human spaceflight and exploration should include— (1) human health and performance research