Numerical simulation was carried out to predict the effect of external temperature conditions on thermal behavior of frozen US military rations, during storage and transportation. An army breakfast menu box containing beefsteaks, concentrated orange juice, peppers & onions, French toast, and Danishes, was selected for conducting this study. Component data and differential scanning calorimeter (DSC) were used to determine the thermo-physical properties of five different food items. Effect of phase change: freezing and thawing, on these properties were evaluated. A numerical model was developed based on the evaluated thermo-physical properties to predict the heat transfer of a frozen U.S. army breakfast menu box containing those five food items. Experimental investigation showed that the average deviation in predicting the thermal behavior of food items in the menu box during thawing ranged from 2 °C to 5 °C. Since DSC did not estimate the initial freezing points of the food items accurately, the freezing DSC thermograms were shifted according to the results of freezing experiments.