Charger
How, where and why Chargers come to be is a mystery to us all, though its theorised they once served as the primary constructors of new Terminid Nests, using their plow like head like a living shovel. So far as you grunts are concerned, the Charger or "Sphere" as I jokingly call it, is effectively 6 tons of Armour, Claws and poor eyesight. Being highly aggressive and territorial, they will often spend their time living up to their name and charging anyone (or anything) they deem offensive and trampling them underclaw. With forelegs strong enough to crush rock like butter and armour whose thickness is measured in many centimeters, that should be more than enough reason to stand well back and attempt to flank its rear where its abdomen is far softer to gunfire.
Despite its formidable speed when charging, Chargers also tend to turn poorly when at such speeds. The Ministry of Defense thus recommends one performs a Rapid Lateral Movement by moving perpendicular to the Chargers direction of attack. SEAF veterans and myself recommend instead you move diagonally towards the creature to especially throw it off.
Alternatively one can simply dispatch the fearsome brute with adequate weaponry of the Anti-Tank variety if available, one shot, shell or blaster bolt is more than enough to crack open either their leg or more importantly, their head
Charger Behemoth
A more mature and rare stage of the Charger's life cycle, the so called Behemoth or "Dozer" is basically an organic battle tank with somehow even less eyesight. Mutated to sport even more armour, so much in fact that its practically pointless to attack from the front. Luckily for us its abdomen still remains relatively unarmoured (albeit dense) and vulnerable to flanking moves. That being said, this is never a beast you want to be at the tusk end of, with legs powerful enough to down even our Exosuits and capable of generating shockwaves powerful enough to be detected on our Richter scales. Do take care, both of your vitals and your footing, when you encounter these rare yet brutish beasts.
Being practically blind (as are pretty much all Charger subtypes), SEAF and Helldiver veterans alike have learned to exploit this by coaxing them into ramming structures and other terrain formations, while this causes no actual harm to the Charger, it does stun it for a brief period, enough to exploit...
In spite of their intimidating presence on the battlefield, the Behemoth's low intelligence and that of all Chargers for that matter can be exploited to effectively run circles around you if one remains aware of their presence. Coordinate with your team so that they can potentially dispatch smaller threats that often accompany the Charger
 Spore Charger
With the onset of the Gloom and its growing presence across the eastern fringes of our galaxy, it appears that the spores commonly associated with the Terminids have begun to infect various Terminid strains, and none exemplify this phenomenon more than the Spore Charger. Practically overwhelmed with rampant spore growths across the outer layers of its skin, the Spore Charger or aptly named "Plague" often lives up to its name by uncontrollably producing spores at such a rate that it actually creates a sickly green fog that conceal both itself and any nearby structure or smaller foe that often accompany it. Keep your wits about you if you choose to enter the fog and be prepared to execute any RLMs when you hear the telltale rumble of it charging...
Fortunately for us, beyond its unnerving ability to effectively conceal itself, it has been since determined by the Ministry of Science to be "no stronger than uninfected specimens", you know the drill, shoot its arse or blow its head open to dispatch quickly.
That being said, the Ministry of Science also greatly advises to stand well back when one is finally brought down, for its spores are often under immense pressure and will generally rupture with great force when punctured, showering the immediate area in heavy slabs of flesh as well as large plates of chitin