Explain the concept of mode of operation in re-entry planning.

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Mode of operation in re-entry planning is the method used to carry out the return based on the mission objective and safety requirements. The mission objective defines what must be accomplished and what hazards must be controlled. The mode then determines which resources are needed and the order in which actions are performed to achieve the objective while keeping hazards within limits. In normal operation, tasks follow the planned sequence with the standard set of resources. If a hazard or anomaly arises, you switch to a contingency or emergency mode, which changes the sequence, uses alternative procedures, and brings in additional resources to address the situation. This approach keeps planning aligned with the mission goals and risk controls, rather than being driven by factors like suit color, weather, or time of day.