How do I PVP with a different character? (There's only one non vet campaign, all my characters are non-vet). Am I really stuck unable to switch the character I PVP with until I reach vet with the first?)
You can't change your alliance, but you can change your campaign. Just select to home or visit the campaign you want and you will get the option to change right then (for an AP cost) or change at the end of the campaign for free.