That is to say, when the special forces are retired, they can't go back to the army after receiving the notice of being recalled, right? What will be the punishment if they don't come back?

You can't help but return; The people's government at the county level will force him to perform his military service obligations and may impose a fine.

According to Article 50 of the Military Service Law, after the state issues a mobilization order, people's governments at all levels and military organs at all levels must mobilize quickly: soldiers in active service must stop retiring from active service, and soldiers on leave or visiting relatives must immediately return to their troops; Reserve personnel and national defense students are ready for active service at any time, and must report to the designated place on time after receiving the notice; Responsible persons of state organs, social organizations, enterprises and institutions, and people's governments of townships, nationality townships and towns must organize reservists recruited by their own units to report at the prescribed time and place.

Citizens who have the obligation to perform military service have one of the following acts, and the people's government at the county level shall order them to make corrections within a time limit; Those who fail to reform within the time limit are forced to perform their military service obligations by the people's government at the county level, and may also be fined: those who refuse or evade military service registration and undergo physical examination; Citizens who apply for enlistment refuse or evade solicitation; Reserve personnel refuse or evade military training, perform military service or enlist in the army.

Extended data:

The relevant requirements for military service stipulate that:

1. Servicemen who are disabled due to war, work or illness shall be properly placed by arranging work, supporting and retiring according to the disability level stipulated by the state. Disabled soldiers, who has the ability to work and is discharged from active service, enjoys the preferential employment policies for the disabled stipulated by the state.

2. After a conscript retires from active service, the retirement fee stipulated by the state shall be received by the local people's government at or above the county level, and economic subsidies may be given according to local actual conditions.

Baidu Encyclopedia-Military Service Law