Every member of the Satan Mercenary Corps was versatile, and for critical roles, there were backup candidates to ensure that no single capability was completely lost in case of casualties.
First, take Gao Yang, who was a marksman and could also serve as a sniper and shoot a shotgun while acting as an assault trooper.
In modern warfare, the role of a sniper within a squad is significant. If Cui Bo were to encounter any issues, Gao Yang could immediately take over as the sniper, and conversely, if Gao Yang faced any problems, Cui Bo could also move forward immediately and fill the marksman role.
Gao Yang and Cui Bo already had the ability to interchange positions; it's just that each had their specializations, but in an emergency, there would definitely be no problems. Thus, whether in the marksman or sniper role, the Satan Mercenary Corps were doubly insured.