Renouncing US Citizenship?

I was born and raised in Boston and have a hard-earned modest pension as a career soldier. I am due to get another federal pension in about 8 years and social security two years later. My question is are these US Government pensions taxable if you seek citizenship elsewhere and renounce your US Citizenship?
Update: Both my parents are from Ireland so I automatically an Irish citizen- I would not be a stateless person
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