Small ships only have one division, while larger ships like carriers or amphibs can have 5 or more. Work for 1st division varies among ships depending on size. On larger ships, the "First" may be in charge of air crew. On small boats, the "First" is in charge of boatswain mates and deck seaman. On ships equipped with small boats, the First Lieutenant or "First" (First Division Officer or Deck Department Head) is in charge of these boats and the sailors who maintain and run them.