"About 500,000 postal retirees receive retiree health benefits. The Postal Service Retiree Health Benefits Fund pays most of the costs. The Postal Service has not made $38.2 billion in required payments to this fund through fiscal year 2017. If it makes no more payments, [OPM] projects the fund will be depleted in fiscal year 2030. [GAO] highlighted several approaches to address this shortfall, such as requiring most eligible retirees to participate in Medicare, increasing cost-sharing, or reducing benefits." [GAO-18-602, published Aug. 31, 2018, released Oct. 1, 2018]