Halo 4 Rank System- What comes next?

I understand that you reach level 50 and then move on to specialisations where you unlock skins etc, but what happens after that? And what happens after you complete a specialisation, do you HAVE to do another?

There are 8 specializations each with ten levels. After all that we just don’t no.

I don’t think you have to do another one, you’d just remain at that level.

Okay thank you both