The B-ration was a United States military ration consisting of packaged and preserved food intended to be prepared in field kitchens by cooks. Its modern successor is the Unitized Group Ration – M, wh
United States Army field cooks preparing B-rations at a field kitchen in Australia, 1942
United States Marine Corps-issued A-ration, colloquially known as a "bag nasty" or "box nasty". In this case the box held two sandwiches, cereal, fresh fruit, crackers, peanut butter, jam, a muffin, salt, pepper, and a drink.