I've seen questions come up about the validity of military ID cards for retirees since the DoD has transitioned to the new form of ID card. According to the CAC website: "Legacy USID cards remain valid through their expiration date, however, individuals with an indefinite (INDEF) expiration date on their legacy USID card may replace those ID cards with a Next Generation USID card." For those retirees that have an expiration date on their military ID card, if you have a photo in DEERS that is less than 10 years old, you can get the next generation ID card online. Otherwise, you'll have to go to a DEERS location to get your new card. Next Generation Uniformed Services ID Card (cac.mil)