Military tactics are the science and art of organizing a military force, and the techniques for combining and using weapons and military units to engage and defeat an enemy in battle. Changes in philosophy and technology have been reflected in changes to military tactics; in contemporary military science tactics are the lowest of three planning levels: (i) strategic, (ii) operational, and (iii) tactical. The highest level of planning is strategy, how force is translated into political objectives, by bridging the means and ends of war. The intermediate level, operational level, the conversion of strategy into tactics deals with formations of units. In the vernacular, tactical decisions are those made to achieve the greatest, immediate value, and strategic decisions are those made to achieve the greatest, overall value, irrespective of the immediate results of a tactical decision.