The South Korean Defense Ministry is planning and pushing forward to conduct a cloud computing pilot project in 2012. Taking into consideration the high-level security necessary in the military as well as wartime duties, if not designed properly, this project may anticipate severe damage to national security and interest. In particular, despite the fact that vulnerability due to inter-Korean confrontation and regular security-related incidents have been triggered, unconditionally conducting a cloud computing pilot project without reviewing not only violates security regulations but also causes various security-related side effects in and outside South Korea. Therefore, this thesis found conditions for conduct of this project by suggesting duties that can apply cloud computing as well as security technology, administration, post-accident matters and conditions for legally solving cloud computing in the military.