Does your CAC have to be updated to reflect current rank?

Now when I was laterally promoted to First Sergeant, I did not get my CAC changed to reflect the new rank, because I knew eventually I would not be a First Sergeant anymore. But I believe it should be updated with every promotion. Though I wish I had a CAC that had Specialist rank on it so when I go to the golf course, I don't have to pay as much.

It was my experience in that you did not update your CaC until you reached E5 because, as you stated, the change in the Geneva Convention Category. I do not see a problem with this for E1, E2, or E3 but I do think when you are promoted you should get a new CaC card because it shows great addition to detail and wanting to ensure all your issued gear, including ID Card are maintained.

Neg. You have to update your ID to reflect your rank. Otherwise when going through the sentry at the gate, you are wearing a pay grade higher than the ID gives, it throws up flags for the sentry; thinking that you have a fake ID (given, that's not the case but there has been stories told). Also for Navy folk, getting onto a ship and going through the quarterdeck, it can sometimes raise alarms too. Plus when you have a senior enlisted looking at your ID.
Just have it updated when you get promoted; save yourself the bullcrap.

I know when I was in Marines the first ID had E1-E3 on it then it was required to update for every promotion for E4 and Above

For USMC and Navy: New CAC at every promotion. Other Services may be different and reserves are a whole different ball game. Semper Fi

In the Navy, E-1 to E-3 CACs only reflect the rank “NON-PO” with an empty pay grade slot. Once you make PO3 or E-4, I was instructed that we were to update our CACs, as E-4 in the Navy is an NCO. And as some people have mentioned, the Naval services (USN, USMC) update their CACs with every promotion. This may of course be different with other services, as I know SPC is not an NCO, and may follow Geneva Convention categories.

I have been Retired 2005 on my ID military it was corporal E4 but the last time she put special E4 I no it paid the same money But I am A Corporal !!!!

I got mine updated every time I got promoted. Now mine has a green band and says contractor. The picture doesn't have enough hair. Maybe I'll fix that some day.

It's a Geneva Convention Card first. On the Back (front now?) it has your Geneva Convention Code Privileges which need to correspond to your worn rank. As such, you need to update it when your "privileges" upgrade, not necessarily your rank, though rank is normally what we use.

In the Naval Services, we just change it every rank (after promotion to NCO). For the Army/Air Force your mileage may vary but if you're a SGT you should have SGT ID, and if you're SSG, same. For Non-NCO, it doesn't really matter.

E-1 thru E-4 no. E-5 and up yes due to the Geneva Convention Category changes.