The US Army Land Warfare Laboratory (LWL) developed an experimental heat tablet of acetal resin for heating combat rations. To use this new fuel source efficiently and provide a support for the ration can or canteen to be heated, the LWL grid was developed. Field evaluations of the grid were generally favorable, although some comments by the users indicated the standoff height of one inch was too much. A decision was made to modify the grid and reduce the standoff height from one inch to one quarter inch. The report describes the modified LWL grid. More detailed background is available in Technical Memorandum No. 71-02, 'Improved Ration Heater and Fuel Tablet'.