I don't think your Federal pension will be reduced. I don't think it is earnings tested.
Social Security does have some clawbacks, but that is not your pension. Those clawbacks to your Social Security benefit occur if you are not at your full retirement age, are collecting Social Security, and exceed the $19K (or a higher limit in the year of full retirement age, but before your birthday). Personally, why worry. Homey don't play that game. Don't let 'The Man' drive your life. The clawback is nasty, but is a percentage of the amount over the gubmint politician defined 'limit'.
For questions such as these I would initiate a relationship with a good financial advisor/planner. Such a person can help you in many, many ways. It is well worth the cost. It is NOT just investment planning, it is things like your question, insurance needs, expenditure planning, health care planning, etc.. Again, well worth the cost.