the plan to develop HTV-X was approved by the Strategic Headquarters for Space Policy of the Cabinet Office, targeting launch in fiscal year 2021 for the flight of HTV-X1 (Technical Demonstration Vehicle) by the H3 rocket. , new ISS plans from NASA's Flight Planning Integration Panel have set the launch of HTV-X1 for February 2022, which is on schedule. In 2022 the debut of the HTV-X spacecraft has been furtherly delayed to January 2024. The HTV-X has a length of 6.2 m, or 10 m with the unpressurised cargo module fitted. The payload fairing adaptor and payload dispenser have been widened from 1.7 m to 4.4 m to allow the pressurized cargo module to be swapped out for alternate modules, to add increased structural strength, and to accommodate the side hatch. , an evolutionary version of HTV-X called HTV-XG is being considered for transferring cargo to the Lunar Gateway as part of the Artemis program. Former evolutionary proposals HTV-R , JAXA was planning to add a return capsule option. In this concept, HTV's pressurized cargo would be replaced by a reentry module capable of returning cargo from ISS to Earth. Further, conceptual plans in 2012 included a follow-on spacecraft design by 2022 which would accommodate a crew of three and carry up to of cargo. Lagrange outpost resupply , both JAXA and Mitsubishi conducted studies of a next generation HTV as a possible Japanese contribution to the proposed international crewed outpost at Earth-Moon L2. This variant of HTV was to be launched by H-X Heavy and can carry 1800 kg of supplies to EML2. Modifications from the current HTV includes the addition of solar electric paddles and extension of the propellant tank. Human-rated variant A proposal announced in June 2008, "Preliminary Study for Manned Spacecraft with Escape System and H-IIB Rocket" suggested combining HTV's propulsion module with a human-rated capsule for four people. Japanese space station A Japanese space station has been proposed to be built up from HTV modules. This method is similar to how the modules in Mir'', as well as many modules of the Russian Orbital Segment of the ISS are based on the TKS cargo vehicle design. Gallery See also Cargo spacecraft Comparison of space station cargo vehicles Cygnus – an American commercial cargo spacecraft that used the communication system developed for HTV Fuji - cancelled Japanese crewed spacecraft proposal HOPE-X – cancelled cargo spaceplane proposal