You'll have a choice, but by leaving, you limit your options considerably. That's because MRA + 10 retirements are unique to FERS. You may not be eligible to retire under CSRS, where you need 30 years of service to retire at 55. If you leave Government, your choice would be to stay in FERS and take an MRA + 10 retirement that can begin immediately, or choose CSRS Offset and wait until age 62 to receive a deferred retirement.
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