Mars Program and shall be budgeted separately from the Moon to Mars Program. (c) Lunar In-Situ Resource Utilization Lunar in-situ resource utilization shall not be considered as risk reduction for the initial crewed missions to orbit and land on Mars. Any lunar in-situ resource utilization activities and shall not be included in the Moon to Mars Program and shall be budgeted separately from the Moon to Mars Program. 207. Core exploration capabilities (a) Sense of congress It is the sense of Congress that ground systems, robust testing programs, and a flight cadence necessary to maintain critical human spaceflight skills are important elements of a safe and sustainable human exploration program. (b) Flight rate and safety After the first crewed lunar landing, the Administrator shall, to the extent practicable, and taking into account the results of the Assessment in section 208(b), carry out a flight rate of at least two integrated Space Launch System and Orion crew vehicle missions per year, until the Lunar Precursor Initiative is complete, to maintain the critical human spaceflight production and operations skills necessary for the safety of human spaceflight activities in deep space. (c) Milestones Not later than 90 days after the date of enactment of this Act, the Administrator shall transmit a list of the key milestones required for completing each of the Space Launch System variants and an estimated date on which those milestones shall be completed. (d) Exploration Ground Systems Infrastructure The Administrator shall ensure that elements of a ground system infrastructure are in place to enable the preparation and use of the Space Launch System, specifically its Block 1 (70 mt) and Block 1B (105 mt) and Block 2 (130 mt) variants of the Space Launch System. (e) Mobile Launch Facility In implementing the requirements in subsection (d), the Administrator shall take all necessary steps to develop and complete a second mobile launch facility that will be in place to support the first Block 1B Space Launch