Synonyms: Milician, Guard, Investigator, Prevot, Bailiff
Captain is an Archetype, it is a special kind of Feat. A character can only have one Archetype in total. Apart from that, Archetypes are like normal Feats and may be taken at character creation or on any level up. On your sheet, mark Captain as one of your Feats and add all Feats gained separately.
The character is a captain in the urban garrison, a milician hired to enforce the law.
Helping people in town, sometimes he must facing dark investigations (murders, rapers, cultists...).
This character leads little troops against bandits, so he gains the Feat Combat (skirmish).
Additionally, he gains one Feat of his choice in this list :