Media misreports on military, again
The military is not calling back discharged and retired individual soldiers. They are dipping into the Individual Ready Reserve. There is a big difference between calling up IRR soldiers and recalling retired or discharged soldiers.
When you sign a contract to enlist or get a commission, it is generally for EIGHT years. You perform four years of Active Duy, then you have four left in the Reserves or National Guard. The branch of the Reserves and National Guard that does not have soldiers perform monthly or annual training is the Individual Ready Reserve. It's usually where the dead weight is put - where those who don't add value are placed to finish out their obligation. For instance, if you had a work conflict with your Reserve committment, you would be placed in the IRR to finish out your committment. If you were consistently absent from the monthly weekend training, you would get placed in the IRR.
Everyone in the IRR should know that they can get called to service just like any other Reservist.