Q: I served three years in the Army from December 1976 to December 1979. After my Army years, I worked for the government under the Civil Service Retirement System from January 1980 to December 1990. I left civil service in 1990 and returned in 1996. I am now under the Federal Employees Retirement System. In 1999, I wanted to payback my military time and was told that since I was under FERS I would pay it back under FERS rules. I paid $530 for my three years. In 2000, I was told that when I was hired I should have…