When the nuke is armed, shuttle can't be called

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It used to run into interference and require you to call it a second time but that was removed at some point, probably because, if you call the shuttle the second the nuke is planted and call it the second time the moment it runs into interference, the nuke goes off with the shuttle two minutes away, or one minute from departure if the crew uses the disk.

Calling the shuttle on nuke is so utterly inconsequential and pointless that I'm not sure what purpose removing it would serve.