Was the chocolate given to soldiers in world war 2 different than civilian?

The "D Ration Bar" was a 4 oz. block of chocolate. It differed from conventional candy store chocolate in that it was larger, very hard (it was designed to withstand weather extremes), and it was fortified with more vitamins and minerals. It was reasonably popular with the GI's, who even invented recipes for it, like "D ration fudge". It did not, however, taste as good as a Hershey bar. The government requested that it have no more taste appeal "than a boiled potato".