Can network security engineers travel abroad?

Most network security engineers can travel abroad. The following categories will be restricted:

The national team, including the army, national security, public security, and banks (in fact, there are restrictions on other positions in banks that need to be reported abroad. Generally, bank employees will hand in their passports, and if they need to go abroad, they need to report in advance. This part of the population is relatively large.

Some well-known information security experts (generally, these people have some undisclosed 0day loopholes, which play an important strategic role in the country. Such people sometimes restrict their exit. In fact, these people are on the list of intelligence organizations in various countries, and even if they can go out, they may not be able to come back. The number of these people will not be too large, and the number of people in the country will not exceed 100.