Battle Mech

The year is 3651, humanity has futuristic technology to the point of massive mechs...

However, 1000 years ago portals began to rip through reality sporadically acrossed the planet where massive alien monsters emerged, attacking any human settlements on site and communication with the species being completely denied, so the act of war was clear.

These monsters(Usually called 'The Xeno' by the guv') come in many shapes and sizes. Therefore it was chosen to use all 26 letters of the american alphabet, and the codewords assigned. Zeta are the weakest, usually called 'The Zerg' by some folk and easily taken down my standard military. Alpha would require multiple high rank M.E.C.H. to even come close to bringing just one down.

These 'Xeno' have made hives along the planets surface to propogate their forces easier and are another key target in destroying the menacing monsters.

And so. The Military, with government funding, created the M.E.C.H. Mechanical Exterminators. Creature Hunters. (Sorry, it sounds cool in my head.) Piloted by...Well, pilots. Who are trained to their strengths.

And these babies come in many flavors!

Vanguard- Light Class Mechs with minimal weaponry(such as the N3022 Pistol Cannon, Mk11Assault Battery Rifle, or maybe the Rakka Sub bolting gun) and armor(Such as the Nanoweave. These sound cool, spare me.) for rapid movement and deployment, commonly used as sentinels along the countries. Built in Long Range Radio to alert Command to breaches (Breaches are called 'Rift Events' or maybe 'Incursions'.). Can hold their own against Monster Class Level Tango and below. Shortest of the M.E.C.H classes.

Tortoise: The Heavyweight Class Mechs with all that firepower! Armor thick enough to withstand a MOAB or an aliens teeth!(advertised at least.) and carrying the latest of heaviest weaponry, from auto tracking quad barrel rocket launchers to fire spitting flamethrowers strong enough to melt rock. She's got it all! Downside? They move as fast as a 4000 ton tank without treads. Nicknamed the 'Fortress' by the more experienced this beast is for those who want to kill their enemy xeno 100 times over. (Trust me, go melee with this thing.)

Eagle Eye: A U.S.A original M.E.C.H with one thought in mind, gun! Given standard medium class plating but unique as having only one arm(interchangable depending on pilot's choice.) that is usually a self loading cannon that fires modified 500x2971 mm(Idk) rounds capable of punching bus sized holes through Xeno. Also provided with jet propulsion for rapid relocation and advantage, one of two M.E.C.H with the ability to use said propulsion.

Zeus: Artillery Anti-Everything M.E.C.H. Heavy armor similar to the Tortoise, save for being lighter and Zeus being armless and a tripod, and boasting as in the name...Artillery! Long range missiles, 7 barrel 5000mm(yes, 5000) miniguns, or maybe just two massive state-of-the-art railguns! Current weakness is that if battling multiple smaller enemies and when within melee distance you have a 99.9% chance of damaging yourself as command didn't have the foresight of anything for CQC... but hey, anything outside of that range is just a numbers game.

Shining Knight: A CQC M.E.C.H from the Britian Isles! naturally used for destroying hives and monsters in enclosed spaces. Armed with the 'Bunker Blade' or similar classed melee weapons that weight nearly as much as the machine, made solely to crush and rip apart Xeno with ease with the assistance of jet propulsion built into the M.E.C.H's forearms. If the large main weapon is too clunky, two 'gore-proof' Chain-Rippers(Glorified Chainsaws) are built into the forearms for quick brutal destruction. Armor is medium for a mix of defence and versatality in the vast hives.

More M.E.C.H pending...