I'm thinking a draft for the vaccinated is plausible.

https://www.king5.com/mobile/article/news/verify/military-service-members-refuse-covid-vaccine-dishonorably-discharged-pentagon-army-navy-marines-air-force/65-49376a02-e341-4d79-9f26-7873980657ec?fbclid=IwAR1JZZ9v-U4eoKRlUa26tKWvPG8bYUupu1bX4ZQCqzYv-wCsoqrBs6hNq3E