Military ships are expensive things to maintain and operate. NA might have some commercial shipping, but given at their heart they're basically survivalists (admittedly on a large scale with designs on taking ultimate power), vessels that suck resources aren't going to be all that attractive to them.
Also worth noting retired naval vessels almost invariably have their weapons and electronics stripped before disposal, even if disposal is selling to another nation (although in that case only the more critical and sensitive equipment will be removed first). Any ships NA may be able to get their hands on pre-nuke would be barely a shell, and probably little more than a rust bucket anyway.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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