10 U.S.C. § 8242

(a) The President may prescribe the components and quantities of the Navy ration. The President may direct the issuance of equivalent articles in place of the prescribed components of the ration if the President determines that economy and the health and comfort of the members of the naval service require such action. (b) An enlisted member of the naval service on active duty is entitled to one ration daily. If an emergency ration is issued, it is in addition to the regular ration. (c) Fresh or preserved fruits, milk, butter, and eggs necessary for the proper diet of the sick and injured in hospitals shall be provided under regulations prescribed by the Secretary of the Navy. (d) The Secretary of the Navy may increase the quantity of daily rations for members of the naval service on a vessel or at a station that has an authorized complement of less than 150 members if the President determines that the vessel or station is operating under conditions that warrant an increase in rations.