I am reading the books again and realized I have a question. If I understand Jorah Mormont's story his father Jeor Mormont (aka The Old Bear) had not been in the Knight's Watch for much more than maybe 20 years. My question is why is he there? Benjen Stark apparently went to the Knight's Watch out of a sense of honor and service. Did Jeor Mormont do the same? Is it possible he was recruited specifically to be Lord Commander? There seems to be no suggestion that he was forced to "take the black."