Apparently there is a whole YouTube subculture for the MRE taste testing community. A Meal, Ready-to-Eat (MRE) is a self-contained, pre-packaged meal designed for individuals in situations where traditional food preparation is not possible, such as military field operations, emergency scenarios, or outdoor activities like camping. Each MRE provides a full meal, typically including an entrée, side dish, dessert, crackers or bread, a spread like peanut butter or cheese, a powdered beverage mix, and accessories like utensils, napkins, and condiments. Many MREs also come with a flameless ration heater, allowing the food to be warmed without a stove or open flame. Designed to have a long shelf life and withstand extreme conditions, MREs are lightweight, portable, and nutritionally balanced to meet the energy demands of users in challenging environments.
IIRC some MRE detractors refer to them as Meals Rejected by Ethiopians.