[Tolerance Sucks Rocks]

From what the website says, the RFID marker is on the syringe itself, rather than being put into you (the Mark). Still, it might be best to avoid it or request an RFID-less syringe, since you will be forever linked to a particular syringe marker.

[EasySt]

No one has noticed yet, but these are “pre-filled syringes”,
so not likely the RFID chip is “optional”.

And the contract is already in placed and announced by the
Department of Defense.

https://www.defense.gov/Newsroom/Releases/Release/Article/2184808/dod-awards-138-million-contract-enabling-prefilled-syringes-for-future-covid-19/source/GovDelivery/

[reformedliberal]

...you will be forever linked to a particular syringe marker.
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That might not be a bad thing. Blood transfusions are also tracked. I got blood for a surgery in 1981. In 1983, in the course of some tracking study or other, I was informed I had received blood from someone with HIV. I went in for testing, twice, IIRC, and was cleared.

Made no difference as I wasn’t infected, but the tracking allowed the testing, to be sure.