At the tactical level, rules of engagement (roe) are tied to the

At the tactical level, rules of engagement (roes) are tied to the need to use force in missions.

Explanation:

In military or police operations, rules of engagement determine when, where, and how force should be used (for example, a submarine from country A cannot attack vessels from country B without an official declaration of war). Rules of engagement must balance two conflicting objectives: the need to use force to complete mission objectives and the need to avoid the use of unnecessary force.

Rules of engagement can be made public, as in martial law or curfew situations, but are typically only known in full by the forces that must abide by them.

b) the planets year length would be longer

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