The numerical size of the armed forces, in their correct perspective as an instrument of the State, as well as the extent to which they are supplied with material components of fighting strength, are matters to be determined by the State after consultation with the responsible military authorities. The development of the essential military qualities of the instrument is the special charge of the armed forces. It is their task to weld the assemblage of men, armed and maintained by the State, into an harmonious whole, skilled in technique and imbued with a psychological and mental attitude which will not admit that any obstacle is insuperable. The Advisory Function. Understanding between the civil representatives of the State and the leaders of the armed forces is manifestly essential to the coordination of national policy with the power to enforce it. Therefore, if serious omissions and the adoption of ill-advised measures are to be avoided, it is necessary that wise professional counsel be available to the State. While military strategy may determine whether the aims of policy are possible of attainment, policy may, beforehand, determine largely the success or failure of military strategy. It behooves policy to ensure not only that military strategy pursue appropriate aims, but that the work of strategy be allotted adequate means, and be undertaken under the most favorable conditions. These considerations require that the military profession be qualified, through the possession of mental power, clear vision, and capacity for expression, to advise the State in military matters. There is thus accentuated the need for mental training, as set forth previously in the Foreword. Military Strategy and Tactics. Military strategy as distinguished by objectives (page 3) representing a larger, further, or more fundamental goal, is differentiated from tactics in that the latter is concerned with a more immediate or local aim, which should in turn permit strategy to accomplish its further objective. Consequently, every military situation has both strategical and tactical aspects. The nature of the objectives to be attained at a particular time, and the action to be taken to that end, may be governed chiefly by strategical, or chiefly by tactical, considerations. Whether an operation is distinctively strategical or tactical will depend, from the standpoint of the commander concerned, on the end which he has in view. To attain its objective, strategy uses force (or threatens such use) (see page 8) as applied by tactics; tactics employed for a purpose other than that of contributing to the aims of strategy is unsound. Proper tactics, therefore, has a strategic background. Definition of tactics as the art of handling troops or ships in battle, or in the immediate presence of the enemy, is not all-inclusive. Such a view infers that the field of battle is the only province of tactics, or that strategy abdicates when tactics comes to the fore.