What Army officer branch does public affairs fall under?

I’ve been searching, and it’s probably civil affairs, but some aspects of the adjutant general corps and even psyops sound similar. The goarmy website does not specify.

It appears to be a functional area for officers already fully qualified in their branch.

http://64.233.169.104/search?q=cache:5RoiF1E4Py4J:www.army.mil/usapa/epubs/pdf/p600_3_46.pdf+army+%22public+affairs+officer%22+branch&hl=en&ct=clnk&cd=1&gl=us