National defense refers to the military activities carried out by the state to guard against and resist aggression, stop armed subversion and terrorists, and defend the sovereignty, unity, territorial integrity and security of the country, as well as political, economic, scientific, technological, diplomatic and educational activities related to the military.

The four elements of national defense:

First, the main element, the main body of national defense is the country;

Second, the object elements, the object of national defense is foreign invasion and armed subversion;

The third is the purpose factor. The purpose of national defense is to defend the sovereignty, unity, territorial integrity and security of the country.

Fourth, the means elements. The means of national defense are military activities and military-related political, economic, diplomatic, scientific and technological, educational and other activities.

The purpose of national defense: ① to defend national sovereignty; (2) Defending national unity; (3) Defending the territorial integrity of the country; (4) safeguarding national security.

The specific content of national interests to be safeguarded by national defense is to safeguard territorial integrity, sovereign independence and inviolability of resources and property; Safeguard national honor and dignity, and consolidate and constantly improve the country's international status and influence; Create a good international environment and stable domestic conditions for national construction and development, prevent foreign aggression, subversion and destruction, and thwart attempts and acts to split the country.

The national defense industry can generate a lot of material wealth and enhance national strength, and some can directly meet the material and cultural needs of the people; National defense science and technology can drive and promote the development of military and civilian science and technology; National defense education can inspire the national spirit and play an important role in safeguarding national security and national construction.

Strengthen national defense construction in peacetime;

(1) There are still various unstable factors in peacetime. Local wars and armed conflicts break out one after another. Without strengthening national defense construction, it will be difficult to cope with possible emergencies.

(2) The preparations for the war are carried out in a long-term peaceful environment. Only by strengthening national defense construction in peacetime can we win the advantage and initiative when the war breaks out suddenly.

(3) Strong national defense is an important guarantee for maintaining peace. In the face of a country with consolidated political power, prosperous economy, adequate defense capability and well-prepared war, no enemy dares to act rashly.

Expanding national defense is a survival science and also a national defense. It refers to the military and military-related political, diplomatic, economic and cultural construction and struggle to defend national sovereignty and territorial integrity and resist foreign aggression and subversion.

National defense comes into being with the emergence of the country and serves the national interests. Churchill famously said, "We have no eternal friends or enemies, only eternal interests." National defense in this language is directly related to national security, national dignity and social development.

Modern national defense, also known as social national defense, great national defense and national defense, is a huge and complex system, including armed construction, national defense system, military science and technology and industry, national defense engineering, military transportation and communication, manpower mobilization, national defense education and national defense laws and regulations. From the supreme head of state to every citizen, from military to politics, economy, culture, education, science and technology and ideology are closely related to it.

Modern national defense takes military forces as the core, including related non-military forces; It attaches importance to the war potential of the country, especially the mobilization efficiency in wartime; It is also a competition of comprehensive national strength based on economy and science and technology. The modern army is an armed group with intensive knowledge and technology, and it emphasizes quality over "sea tactics". The role of national defense in peacetime is deterrence, which requires winning without fighting; The duty of national defense in wartime is actual combat, and the goal is victory.

References:

Baidu encyclopedia-national defense