Forum Thread
Maybe with the S.H.I.E.L.D Clearance levels coming soon? Agree, it could be very helpful for comms and mercs both.
For me, the main thing is the ISO rewards. But, yeah, showing off my rank 65 is kinda fun. Like slipping the fact my rank is 65 into a random forum post. 
You haven’t reached level 66 yet? That’s OK, neither have I.
Yeah that was my only complaint with sheild ranks is that I thought it should be something you can see on others. I would like for it to ideally be on their roster screen and on the alliance members details screen.
Yeah I agree it would be nice to know the rank of other players. I know who is going to be the first rank100 but maybe there is a surprise…
Almost rank66, but it is slower than what I thought. It is required to do the 2 cycling to go faster…
ISO is for sissies !!! The only important part is showing off !!! 
I put my ranking in my signature here. 
As far as it being visible to players within the game…I don’t know. I think it’d be good to see amongst Alliance members but I don’t think I want my opponents seeing it. I feel like some players would intentionally target lower-ranked agents.