Yes, it does say that, but I forget which page it's on, and I don't have my rules here to check.
Note that while the number of cards poses restrictions, there are certain other restrictions, depending on the army which you are playing regarding the overall number of support cards you can take, which relates to the number of company cards or the equivalent.
In addition to special cards, free cards are also limited to the sole card which comes with each respective supplement.
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Soñando con una playa donde brilla el sol, un arco iris ilumina el cielo, y el mar espejea iridescentemente.