Frank then looked at Big Dipper, who was under the Level 2 clone's control. "Big Dipper, vanguard?"
Vanguard soldiers could be understood to be scouts or sentries, or could also be understood to be cannon fodder.
An outstanding vanguard could effectively prevent troops from falling into an ambush. They could lock onto a mission target beforehand and attack first to prevent the enemy from attacking or retreating. This was one of the most important positions in the team.
An incapable vanguard might be killed by their teammates, since it would be very easy for them to lead the entire team to their downfall.
In this team, only Frank, Luke and Selina were qualified to be the vanguard.
But Frank was the commander, and had to stay in the rear to control the situation.
Selina had already chosen the Gatling gun; she was clearly going to be the firepower to overwhelm the enemy.
