There are many other impacts that gender roles have in reference to K-pop. One of the bigger impacts is with foreign affairs. According to South Korean media, the Ministry of Defense set up many large TV screens across the border in North Korea in order to broadcast music videos by many of the notorious K-pop girl groups such as Wonder Girls, Girls' Generation, After School, 4Minute, and Kara as part of "psychological warfare" against their rival country. Sources close to the country said that the "revealing" outfits worn by the female singers as well as their provocative dances may have a significant impact on the North Korean soldiers.