Proposed Oath:
I, [leader of nation] pledge to never engage in conflict with any other members of NPTO, protect the other member nations in their time of need, and to only use my army for the good of the other member nations. I will break the barriers between governmental types and work together; and I will help my organization to not be the battle ground between dictatorships and democracies, but instead, help form the shield of peace surrounding its member nations that I most honorably shall protect.
Syrixia, having two threads and different oaths will be confusing to new nations wanting to join, which I thought it would be better to move one.
And Plem, the Assembly sounds more like a general assembly, not a security council. If you really wanted a security council, which I would probably call E5 (Entente of Five), since SC is heavily used, would probably bring more power away from the chairman. Also, this helps strengthen NPTOPF because until the formation of the Blue Berets (UN Peacekeepers) the UNSC had no real power.