Shelf life

How could chicken sandwich stay “fresh” for two years? Leave it to the military to find a way:

“If you think about bacteria as sprinters in a food system, what we’re trying to do is put enough hurdles in so they can’t survive,” Richardson tells The Salt. She says the hurdles include lowering the pH, binding the water to something the bacteria can’t use it, and adding a packet of “oxygen scavengers,” or iron filings, to absorb the oxygen so that it’s not available to bacteria, yeast and mold. “All this keeps the bread, meat and filling from going rancid.”