NASA has revised its Artemis program, delaying the first crewed lunar landing to Artemis IV in 2028, while Artemis III, scheduled for 2027, will now conduct a lunar lander checkout in Earth orbit. This adjustment, prompted by the Aerospace Safety Advisory Panel's concerns about Artemis III attempting too much, aims to reduce risk by verifying critical systems like life support and propulsion in low Earth orbit before a lunar mission. The revised Artemis III will include rendezvous and docking with commercial landers from SpaceX and Blue Origin. This shift follows earlier doubts about SpaceX's readiness and a competitive reopening of the Artemis III contract. The accelerated mission cadence could lead to a second lunar landing in 2028 with Artemis V, but may deplete NASA's stock of Space Shuttle Main Engines, necessitating the development of new ones and potentially impacting the Exploration Upper Stage.