Board Thread:Warhammer 40k Tabletop Gaming/@comment-50.43.58.211-20131128214056/@comment-3580035-20131130010856

A dedicated transport can only be taken in an army attached to a unit that says it can take it. At the start of the game during deployment, the only unit that is able to be deployed within the dedicated transport is the attached unit. Once the game has started, other units that are able to can embark and use the transport, and there are no restrictions with it use.

In the case of the Drop Pod, it is impossible to embark a unit into it once the game has started as it is in reserve. Therefore, the only units that can begin the game in a Drop Pod are those that can take them as dedicated transports.