If the son is in a bad mental state in the army, the army may consider withdrawing troops. However, this requires strict procedures and audits, and certain conditions need to be met.

First of all, the army will communicate with his son to understand why he doesn't want to be in the army and help him solve the problem as much as possible. If no settlement or consensus can be reached, the troops can start the withdrawal procedure.

Secondly, the army will make a comprehensive assessment of his son's physical condition and mental state to ensure that he can continue to serve in the army. If he is found unfit to join the army, such as physical illness or psychological problems, the army will also consider withdrawing.

Finally, if the army thinks that his son does not meet the conditions for withdrawing troops, they will try their best to persuade him to stay in the army and provide more support and help.

In short, if the son encounters difficulties or problems in the army, he should report the situation to the army in time and seek help and support. At the same time, we should maintain a positive and optimistic attitude, strive to overcome difficulties and make contributions to the army and the country.