Hmm. If the shitty one shot at the pretty one (assuming it must be American) then that would make sense. But the "Moudge Class Frigate" (https://en.wikipedia.org/wiki/Moudge-class_frigate) that did the shooting apperas to be the prettier one. So how could the Iranians mistake that rusty tub for a hostile ship?
https://www.youtube.com/watch?v=b0zFe6ia4D4
oops
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Leave it and instructions with someone you trust ''and who your enemy does not know to be associated with you (critical)."
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Or dump it on the internet in heavily encrypted form and leave only the passphrase and instructions with someone you trust.