NASA is seeking proposals for CubeSat payloads to fly on the Artemis III, IV, and V missions, with opportunities for 6U and 12U satellites deploying from the SLS in Earth orbit or on heliocentric disposal trajectories. These are cooperative, no-exchange-of-funds flight opportunities supporting NASA's exploration goals, with selection based on proposal maturity and technical feasibility. Responses for near-term missions must be submitted by June 1, 2026, including a letter of intent and completed questionnaire. Performance location is in space, deploying from the Space Launch System after Orion separation. No budget amount is specified.