So a question about the POTUS tweet about the vaccine being released 5 years ahead of schedule, what vaccine is this? Is this the one that has been sterilizing and killing/making people sick or is this a different one? I'm sort of confused

https://www.whitehouse.gov/presidential-actions/executive-order-providing-order-succession-within-department-defense/

What is this? what does this mean in layman's terms?