By Frank Main and Fran Spielman, includes “… He said a change in health insurance benefits is a factor, while the police union president blames Mayor Lori Lightfoot for not backing police officers. … Lappe said his concern is that a large, sustained wave of retirements will harm the pension system’s financial health. Even now, about 850 more retirees are drawing a pension than the number of officers working on active duty, Lappe said. Two decades ago, those numbers were reversed …”