10 U.S.C. § 9561

(a) The President may prescribe the components, and the quantities thereof, of the Air Force ration and the Space Force ration. He may direct the issue of equivalent articles in place of the prescribed components whenever, in his opinion, economy and the health and comfort of the members of the Air Force or the Space Force so require. (b) An enlisted member of the Air Force or the Space Force on active duty is entitled to one ration daily. The emergency ration, when issued, is in addition to the regular ration. (c) Fresh or preserved fruits, milk, butter, and eggs necessary for the proper diet of the sick in hospitals shall be provided under regulations approved by the Secretary.