Defense Policies in the Modern Countries are the most important policies in the field of National Defense.
The Republic of Korea's Defense Policies have developed with three phases based on the international security environment, Korean peninsula situation, countries' capability in her historical changes as the following.
First, Defense Policies (1945-1961) in the period of establishing Defense System were pursued the defendant self-defense policies under supporting and depending the United States.
Second, Defense Policies (1961-1998) in the period of proceeding Self-defense were executed the his own self-defense policies due to the domestic and foreign crisis situation in the Korean Peninsula.
Third, Defense Policies(1998-2000's) in the period of developing Self-defense has been propelling the cooperative self-defense policies in order to Peaceful Unification in virtue of the changing international security environment and developing South and North Koreas relationship.
In conclusion, the Republic of Korea should have developing its Security Policies, Defense Policies, and Military Policies, which could be adoptable to the Republic of Korea's situation in order to defense the her country from military threats such as various warfares, and from non-military threats such as terrorism, mass destruction weapon, drug, crime, disasters, and so on.