Military “rations” have a limited shelf life. It is better to consume them than it is to discard them. As they are consumed they will be replaced with fresh stock with years of shelf life remaining.
It is likely that the sudden withdrawl from Afghanistan created a massive surplus of field rations that will need to be consumed.
This is nothing unusual. The answer is to quit complaining and just chow down.
Military “rations” have a limited shelf life.