 Informally, they help U.S. soldiers new to the peninsula understand Korean customs and a bit of the language.It saves the U.S. money and manpower, and symbolizes the two nations' friendship and mutual support.The KATUSA program remains essential for the safety of the Republic of Korea, not only for establishing partnerships with American Armed Forces, but to learn from each other and to assist each other, especially with the threat of North Korea looming over South Korea.