This thesis is an attempt to come up with entry strategies for Korean defence industry to the American Defense Industry Market. In general, the defence market in a country is characterized by monopolized demand, high risk, forward and backward linkage effects, and political positions, making it almost impossible for defense businesses to purely act on economic principles. Korean Defense Industry has come to its maturity, after a relatively short period of development. But many obstacles, rather institutional and structural than purely economical, are keeping Korean Defense Industries from selling their products overseas. This thesis reviews the possibility and plausibility of Korean Defense Industry`s penetrating into the US Defense Market, the biggest defense market in the world.