are you talking about this bundle?
http://www.amazon.com/Men-War-Assaul...0073431&sr=8-6
it doesn't say anything about the DLC being included.
at any rate, both Assault Squad and Vietnam can be activated on Steam (and only on Steam), and both games have DLC available only through Steam.
so, in order to get the DLC you'll have to activate your games on Steam. whether you'll have to purchase the DLC or if your activation keys allow you free access to the DLC is a different matter. you'll probably have to purchase the DLC.