This rule was created by the CHERUB ethics committee. It gives every CHERUB agent the absolute right to refuse to go on a mission, or to quit a mission at any point without fear of punishment.

The ethics committee introduced this rule in 1957. The committee felt it was essential to stress that no CHERUB agent is ever forced to go on a mission or put themselves in a dangerous situation against their own will.

In practice, the rule is rarely invoked. CHERUB agents usually compete for positions on the most dangerous and exciting missions.