Bulletproof masks had become a necessary equipment from a rare gear, due to what reasons?
It's simple, once you are shot by Gao Guang, you'll know.
To deal with Gao Guang's marksmanship and speed, the simplest way was a bulletproof mask; other methods such as countering with gunfire or employing heavy firepower to bombard him were unrealistic.
The simplest method achieving the best effect, eventually led everyone to use bulletproof masks.
A distance of five hundred meters was somewhat too far for an assault, fully armored and carrying a bulletproof shield, crossing this distance was not only dangerous but also a waste of time.
Yet, no one knew how Knight Mercenary Group would solve this problem.
Drive there? Or... how about driving? If not driving, there really was no other way; there were no tanks for cover, no armored vehicles to safely transport troops to the front, and no helicopters for an air drop.