Start with giving them this letter.
Once given to them, if you are fired, smile at the money they are going to lose in a civil lawsuit to you.
Smart employers will pass this letter to their legal council, and when their council informs them of the multitude of laws they will be violating by forcing the "vaccine", they should quickly back down.
The military is still not allowed to follow ILLEGAL orders (which Biden mandating an experimental drug is) and they are also bound by the Nuremberg Code.
Ironically, the Nuremberg defense of "I was just following orders" would apply to ANY military official who tries to coerce, in any way, anyone to take the vaccine. It is a WAR CRIME under international law.