Anyone here fighting Fed. Employee mask policies?

I work for the Post Office and after almost a year of this pointless charade and NOT wearing a mask, I am once again being harassed and coerced and bullied into wearing a mask, even as states are dropping mask mandates.

It's a little different fighting Federal, I think, but the intention is to draw up paperwork whereby the Post Office and it's managerial chain must show me where I agreed to give them the authority over me medically, and whether they are willing to accept liability for any health issues or complications from mask wearing.

Further, they provide non-medical masks while trying to enforce medical intervention without license to practice medicine or evaluate risk factors.

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What I'm hoping for is thread is any anecdotal fighting experience

Or

Simply listing all well thought out reasons why mask wearing is non-effective, potentially harmful, and otherwise illegal to require of a human being and violating bill of rights/constitutional freedoms including religion.