On the first page of the Skills and Tasks chapter it says that when a Traveller reaches Rank 1 in a skill with specialities they have to choose a speciality. However on page 62, just before the skill descriptions, it says that when a Traveller reaches Rank 1 they can take a speciality implying it may be optional. Obviously not taking a speciality gives skills a lot more bang for your chargen buck so presumably they arent optional?