Heavy class

The Heavy is a playable class in. Having the highest base health (2,200), this class generally focuses on survival & supressing groups of enemies. Speed and firepower can be stressed, albeit to a lesser extent than the Assault class. If survival is the main priority, the Heavy is the best class for it. Heavy's starting weapons are the Z-5 Heavy as primary and (as is the case with the other classes) HVM 001 as sidearm.

Skills

 * 1) Hold The Line: Increases your damage and weapon penetration while not moving for a short time, or by one half the listed bonus while moving. This skill can increase the Heavy's DPS dramatically. At max, damage and pierce will be increased by 126%, or 63% while moving. This skill is really useful when you use weapons with high damage dealing, RoF (which likely come with movement penalty as a drawback) like MGs, Flamethrower and/or equip armor pieces that have significant movement penalty (like Hardplate pieces)..... Packing this skill with other passive skills of Heavy can make you a near-immovable force.
 * 2) Heavy Gear: Reduces movement penalty for ALL weapons and armour. This skill can ultimately nullify all movement penalties, enabling the Heavy to use any weapon and armor piece without being slowed. This skill makes heavy equipment (like Hardplate armor and LMG's) slow the Heavy down less. Combined with masteries and collections, Heavy Gear can reduce movement penalties below 0%, which adds movement speed. The M1000 with Maxed Heavy Gear and all masteries and collections adds about 20% movement speed. This skill also helps you save cash from using for Skeletonized augment as it could only apply for the chosen weapons.
 * 3) Tough Body: You are so tough you are more resistant to damage than normal. Tough body is able to reduce even Dark Minion damage, which ignores a large amount of damage reduction from armors. At max, damage resistance is 54.00%. Giving this skill enough points would significantly improve your damage resistance without spending much for Toughness & Body Armour Expert. If possible, spending skill points equally for each of them is recommended as well.
 * 4) Die Another Day: Become 90% immune to damage for a short time. Die Another Day can save your life if your health is very low or prevent your health from becoming low. It is extremely useful when running past a strong boss or when surrounded by a massive horde of zombies (such as the horde in the Meltdown secret cave). This skill grants you better chance to survive in Last Man Standing & Apocalypse mode & even Nightmare mode. It should be noted that this skill uses 39 points for each use. Therefore, it's recommended to spend enough skill points not only for this skill (to extend duration) but also for Energy Boost / Energy Regen to assure you can use it as frequently as possible. It also takes 50 seconds until the next use so timing is needed as well.
 * 5) Brute Strength: Your brute strength allows you to push boxes faster and deal damage to zombies by running into them. With this skill, you can push through hordes of zombies more easily while dealing damage. It is useful if you constantly find yourself surrounded, though at high levels, the damage is negligible (but still useful when you are reloading). Aside that, this skill is crucial when you play maps that have lots of movable obstacles.
 * 6) Concussion: Your shots have a chance to stun zombies. Guns with a high RoF and/or multiple flechettes are ideal for stunning. Good examples are weapons with high RoF & shooting many flechettes as they put out a lot of shots, allowing them to easily stun-lock zombies. MGs with high RoF & capacity are also a good choice. This skill gives you better chance to deal with Boss Zombies with Extra fast (especially enraged Devastors whose speed is already fast).
 * 7) Aerial Bombardment: Powerful orbital strike deals massive damage in a targeted area. This skill is very helpful against large, tightly-packed hordes, as its damage is high and its pierce is infinite. It's recommended to give this skill enough skill points to increase the area that it could inflict mass destruction (One extra blast will be added after every 3 levels & each level-up increase damage dealing of each blast). This skill costs 60 energy points for each use & has 90-sec cooldown so considering when to use is crucial.

Trivia

 * The Heavy soldier shown in the image is wielding a LMG that looks almost identical to the HVM 008
 * As seen in the above image and in-game upside-down illustration, the Heavy Soldier is shown to have his left arm equipped with some sort of exoskeleton.
 * This exoskeleton equipment is likely what assists Heavy soldier when he uses heavy weapons like Machine Guns, Flamethrowers,....
 * It's also possible that the entire of his left arm is prosthesis like Winter Soldier (a fictional character from Marvel). Coincidentally, Winter Soldier prosthetic arm is also the left arm.
 * One extra coincidence is that in MCU, Winter Soldier was mostly seen using a Machine Gun (specificially M249) like Heavy as well.
 * Heavy soldier is probably inspired by The Heavy Weapon Guy from Team Fortress 2. The latter is also known simply as Heavy.
 * Both are shown to have the most HP by default at the cost of lowest movement speed.
 * Both mostly uses (Heavy) Machine Gun.
 * The Heavy Class model seems to be wearing HVM Combat Boots.
 * The SAS 4 beta Heavy held the HIKS R40 in its class picture.
 * The Heavy soldier is the icon of SAS4 Mobile, as of version 1.8. The Steam version of SAS4, which is a port of mobile version, still retains its original skull logo.