I had to get a new one 5 years ago when I turned 65. The new one had changed the ID# from SSN to a unique DoD ID#. Something I had not had on my ID since early 72 when they changed from my original service # to SSN.
It will be interesting to see what this one looks like, but, no hurry, especially with the scamdemic mask mania still going on.
Go to this DoD site to see the new card with a full explanation about it: https://www.cac.mil/Next-Generation-Uniformed-Services-ID-Card/