What about the UUS PBGC? Pension Benefit Guarantee Corp..... Won’t the make up some of the difference?
http://www.pbgc.gov/wr/find-an-insured-pension-plan/pbgc-protects-pensions.html
While we insure most private-sector pension plans, Congress has also defined exceptions that PBGC does not insure. For example, PBGC does not insure: federal, state, and local/municipal government pensions,
theres a limit.