Ranks
Rank 1
You can have up to four active crew members.
Rank 2
You can have up to five active crew members.
Rank 3
You can have up to six active crew members.
Rank 4
You can have up to eight active crew members.
Challenges
Rank 1: Destroy or board 5 ships with a crew of 2 or more.
Rank 2: Destroy or board 25 ships with a crew of 4 or more.
Rank 3: Destroy or board 50 ships with a crew of 5 or more.