Military and Federal Retirement Pension

"...I receive military retirement pay under FERS for 21 years of service in the Air Force. I started working a job as a federal civilian employee two years ago. I did not buy back my military time. If I continue to work as a federal civilian for another seven years (bringing my total federal
service to 30 years), how will my retirement pay be affected? ..."

Read more at federaltimes.com

Buy Back Military Time for Retirement

"...Before military time can be applied toward civil service retirement, in most cases the employee has to "buy back" the active duty time..."

Read more at defense.gov