The $5.4 billion payment is one of a number. They finally ran out of money.
I am tired of subsidizing the taxpayers!
No, it seems like YOU missed a lot of things.
The USPS does borrow money from the taxpayers: http://money.cnn.com/2013/02/06/news/economy/postal-service-cuts/index.html
They also lost $16B last year. The last time you claimed that the USPS was solvent, I did the math for you and posted the loss in 2012, EXCLUDING pension payments. You may go look it up in that thread if you are still hazy on these points.
As a taxpayer, I am tired of subsidizing a bunch of lazy union USPS employees who enjoy an anticompetitive monopoly on First Class mail. Break up the USPS for scrap and sell it off, or failing that, terminate the taxpayer loan facilities and eliminate the monopoly and let’s see if the USPS can stand up on its own two feet or if it collapses under the weight of all of the fat union morons.