[quote=@Hank]Feel free to choose any of the open roles but if you're lost and would like a suggestion, important roles are the Commander, [b]Investigator[/b], Shocktrooper, Medic and -- last but decidedly not least -- [i]ordinary Arbitrators.[/i][/quote]

[@Andreyich] As you can see, certainly. It won't be all combat. I'll explain some more about how the non-combat specialties fit into the game in the Gameplay section. In the same vein, I forgot to list another important role; the Verispex Adept. That role is instrumental in gathering clues. 

EDIT: Added a little explanation to the first post.