First of all, Soldier Assault is a film and television work. Personally, I think that the most distinctive thing in film and television works is visual contrast, so the equipment of Old A is different from other troops.
Second, the prototype of the old A should be the military command team, which is naturally better equipped than other arms, otherwise it will not be "special";
Third, Old A also combined the image of imaginary enemy troops, so their clothes also had the shadow of old beauty.