The main reason for delays is related to security. Amit Kshatriya, deputy director of the Moon to Mars program, noted that bringing new capabilities to Artemis 2, including fuel loading and advanced life support systems, required additional preparation time.
Problems identified during Artemis 1, including Artemis 3’s heat shield and life support components, led to a detailed analysis. Unexpected events in the heat shield and defects in the engine valve circuit were noted; This requires further investigation and resolution of the problem.
Source: Ferra

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