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There is no clear canon explanation. Most likely all command level officers have codes that enable them to destroy ships, and presumably outposts and stations, along with the consent of other officers, likely at least one will need to be "local". From TNG we know Picard and Riker can jointly activate the autodestruct, the captain and first officer, in FC, it is Picard and Crusher and Worf, one could surmise that the two leading officers may be replaced by any two other commandlevel officers, in this instance, Riker is substituted by Worf and Crusher.he was a command level officer, even though he was not part of the Enterprises chain of command.

One could also assume that Picard gave him authorization to do so.

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