According to the provisions of "People's Republic of China (PRC) seafarers' training certificate examination and issuance method", the training theory of ship security officers will have to wait at least 6 months before they can take the examination again. This is because ship security officers need to have a solid theoretical foundation and practical ability. In order to ensure that they have enough knowledge and skills, they need to be given enough review and preparation time. There is no need to wait at least 6 months for the training theory of ship security officers.