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The army rule doesn't give you the ability to disembark after the transport advances on its own, it simply provides a bonus move in the event that some other rule makes it possible. Another rule has to exist to allow you to disembark from a transport that advanced and the stratagem is that additional rule for most transports.
It's a little confusing because both rules are still bound by the normal transport rules but written to cover other rules that let you break them.
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