1. Registration time has passed: military security training usually requires registration in advance. If you miss the registration time, you will not be able to attend the training.
2. The places are full: Military security training places are usually limited. If the number of applicants has reached the upper limit, you will not be able to attend the training.
3. Registration conditions do not meet the requirements: Military Mi 'an training has certain registration conditions, such as age, education, work experience, etc. If you do not meet the requirements, you will not be able to participate in the training.