The situation can change in minutes during the combat and any soldier has to adjust to it, change his weapon, add armor or take a part of it out. In past days you had to switch to another vest to change the magazine's type or to get more armor.
AVS perfectly deals with this problem. It allows you to immediately switch between the gear elements, to make a light plate carrier for operations where your speed means everything or it allows you to carry more armor for a local operation where the risk of stopping a bullet or getting hit by a fragment is extremely high.
One of the vest's feature is that it provides an opportunity to use a special corset that supports the operators back by redistributing the weight and allowing even an untrained person to wear a heavy vest.
All in all AVS is the most advanced and one of the most expensive armor system of modern age. However, if you are a professional and you need an extremely comfortable and trust-worthy modular system — AVS is the best choice among all other things.