We use data from workers in the largest public-sector occupation in the United States -- teaching -- to examine the effect of pension enhancements on employee retention. Specifically, we study a 1999 enhancement to the benefit formula for public school teachers in St. Louis that resulted in an immediate and dramatic increase in their incentives to remain in covered employment. To identify the effect of the enhancement on teacher retention, we leverage the fact that the strength of the incentive increase varied across the workforce depending on how far teachers were from retirement eligibility when it was enacted. Although we document substantial differences across teachers in how their retention incentives were affected by the enhancement, our results indicate that these differences did not translate into meaningful changes in behavior. The following are appended: (1) Pension-Wealth Calculation Details; (2) Supplementary Tables; and (3) Using a Cost-Benefit Framework to Gain Insight about Novice Teachers.