Space Hawks is a short six volume series of Choose Your Own Adventure books. Unlike typical CYOA books, these contain a narrative that continues from one title to the next.
In the first book the reader qualifies to join the Space Hawks (subsequent titles require the reader to help the Hawks fight off various threats).
Because these books rely more heavily on narrative more than other Choose Your Own Adventure titles, there are longer sections of text between reader decisions. Constant choice is sacrificed in the name of storytelling.