When Liuyu first participated in the martial arts training camp, he could only run about 20 minutes in five kilometers, but after three months of high-intensity training, his five kilometers improved to about 17 minutes, and he was one of the best results in their border defense regiment at that time.

The training at that time was unforgettable for Liuyu, although he was not trained to lie in bed and couldn't get out of bed, but Liuyu injured his leg because of the training he worked very hard.

It was also the training at that time that tempered Liuyu's will and perseverance, so Liuyu was able to persist in the training until she almost exhausted herself to death.

Although Liuyu's current training volume seems to be very large, his physique is no longer the same, and he doesn't feel tired during the martial arts training camp.

This is also thanks to the scientific training method of Black Steel, on the one hand, Black Steel arranges a lot of training, on the other hand, he gives Liuyu the best nutrition package every day, and will personally relax Liuyu's muscles, and even help Liuyu channel the disordered dark energy in his body.

Under the careful training of Black Steel, Liuyu's physical fitness and the growth rate of dark energy have been greatly improved.

When Liuyu could run 100,000 meters with a weight of 30 kilograms, his dark energy had directly broken through to the sixth level. Generally speaking, the recruits recruited by the border defense black company are below level 3, and one of the purposes of recruit training is to help recruits upgrade their dark energy to level 4.

Level 4 is the minimum standard for border black companies, and all qualified border black company fighters have a security energy level of level 4 or above.

Liuyu was already level 4 on the first day of training, so Black Steel didn't stop doing it and helped him upgrade to level 6. You have to train something that is not, otherwise it will be as if the instructor is idle.

The plans of the other instructors are to gradually increase the amount of training of recruits, as long as their dark energy can be upgraded to level 4 by the end of recruit training, only Black Steel and Liuyu are on the side, and they rush to level 6 in one go.

After rushing to level 6, Black Steel finally gave Liuyu other lessons, such as the use of the Border Black Company Battle Armor.

Other recruits are interspersed with learning while training physical fitness, such as running 30,000 meters in the morning and learning other things in the afternoon, but Liuyu can't help it, because 100,000 meters is almost a day. If it is on flat ground, it may be faster to run, but when running in the mountains and there is no road, running 10,000 meters an hour is already the limit of Liuyu.

The armor of the border defense black company is divided into light armor and heavy armor, and the light armor is mainly exoskeleton, with dark matter alloy as armor, which can wrap all people.

The main function of light armor is to bear weight and provide defense, and it is equipped with rifles, pistols, grenades, communication equipment, etc., which are only used by ordinary infantry.

Although the light armor is light, it is very powerful, and even if ordinary people wear it, they can carry three hundred attack weights without difficulty. Although the armor part is thin, it can defend against the close-range shooting of the electromagnetic rail rifle, and basically all the light weapons on the Blue Star can be defended.

Because the light armor is also made of dark matter alloy, it can react with dark energy, so a dark human like the border black company soldier wears it, and the effect will be greater.

Heavy armor is based on light armor, with appropriate thickening of defense and loading of multiple weapon modules, so that soldiers can directly wear heavy armor while wearing light armor. The size of the heavy armor looks very large, which can be understood as a wearable robot.

The heavy armor can be customized according to the characteristics of the wearer and the particularity of the task, and the ordinary handling model of the heavy armor can carry more than 1 ton of materials.

In addition to light armor and heavy armor, the border black company will really be equipped with a self-powered combat box, which is the same box as Yan Liang's "Xiao Liangliang". The contents of the box are also customized according to the different characteristics of each soldier, and it is an important supplementary equipment in combat conditions.

This set of armor settings of the border defense black company is very practical, you can wear light armor in daily conditions, and you can go into battle at any time when you have an urgent mission.

When you plan to carry out medium and long-term missions, or participate in high-intensity combat missions, you can carry and wear heavy armor, and then match it with a combat box, and the firepower of a single soldier is equivalent to that of a company.

The combat composition of the border black company is generally a small team of four to five people, and four to five people wear different types of heavy armor and combat boxes according to their own characteristics, and if they cooperate well with each other, they can carry out effective operations in an area of several tens of kilometers.

For example, the firing range of an ordinary electromagnetic rail rifle is tens of kilometers, but according to the use of border black company soldiers, the effective range is generally within 20 kilometers, and it is too far to aim, and the power will be weakened. But when working together, it is completely possible for one person in the team to carry a heavy electromagnetic orbital sniper rifle with an effective range of up to 80 kilometers.

The use of the border black company light armor is relatively simple, because it is a close-fitting battle armor, as long as you can adapt to it, and then skillfully use the exoskeleton system, communication system, and weapon system carried on it.

But heavy armor requires more practice, and the feeling of walking in heavy armor is different from usual, and the heavy armor is generally equipped with heavy individual weapons, which can only be used through the mechanical arm of heavy armor.

The arm of the heavy armor is very thick, and its head is also shot into the shape of five fingers, but the wearer's hand can only reach the position of the wrist of the heavy armor, and the palm and five fingers of the heavy armor are controlled by a sensing device, so that the wearer's feel is completely different from when wearing light armor.

This thing is easy to say, but it is actually difficult, because you need to change the habit of using the five fingers, it is a habit when you put on heavy armor, and it becomes the original habit when you take off heavy armor. Heavy armor wearers have to constantly switch between these two habits, and some people practice and practice not only not wearing heavy armor well, but even their normal behavior habits have become bad.

Only soldiers who can skillfully use light armor and heavy armor can go to the front line, they are the main combatants, participate in the most intense military operations, and soldiers who are not proficient in using heavy armor can only cooperate with heavy armor warriors at most, and the battle is generally based on heavy armor warriors as the core.

The light armor warriors who can work with the heavy armor warriors are all elite warriors who take the light armor to the extreme, they just don't have the talent to wear heavy armor, but their combat effectiveness is very high.

There are also many soldiers who can't wear heavy armor but wear light armor and have average combat effectiveness, and the general task of these warriors is to carry supplies for heavy armor soldiers.