Currently, the ID cards issued to members of the U.S. armed forces provide identification and access; they have the ability to carry other data. Whether they do or not, I am not sure. Even at this tech level, they contain multiple means of conveying information. As memebers of the the Imperium's armed forces will be operating on worlds of varying tech levels, I would posit that they would carry tags that have the highest tech encryption for identifying data, including biometrics, along with methods for being read at lower tech levels, down to embossing text and recessing a picture of the wearer. RFID may be present, as a convenience, even though it may not survive EMP; in a scramble to board the assault craft as the mother ship has been hit, the scanner at the lock notes who boards, and transmits the "hatch-closed-manifest" to the ship's computer. When all craft are away, the ship transmits an encrypted manifest to the fleet, all without sophants having to divert their attention from the unfolding emergency. When trying to convince the TL3 residents of the planet upon which Spaceman Spiff of the IISS has crashed his ship that he is in fact an officer of the Imperium, having the Imperial Sunburst, his picture and writing upon his ID tags might be a good thing: an interstellar, cross-cultural blood chit; dog tags; ID card; and flash drive?
I hadn't thoght of that one: ID tag is inserted into helmet, and acts as a mini "black box," recording the most recent events a servicemember experiences through hemet cams and other monitors?
I hadn't thoght of that one: ID tag is inserted into helmet, and acts as a mini "black box," recording the most recent events a servicemember experiences through hemet cams and other monitors?