I'll start with a few of those 'rumored' ones I hinted at in the original application for the Assault/Aegis Contingents, since I have some ideas for them.
Assault Contingent Model-"ROC":A massive superbomber/aerial fortress used by the Assault Contingents, the ROC series isn't commonly known about even within the Mechera military. Easily the size of a city, these weapons are used for terrestrial warfare, flying using the same anti-gravitational systems as the Shield model has to fly. Aside from simply bombing foes into submission with a range of every form of bomb the Mechera can use, ROCs can also use the six massive turrets on their backs to shoot enemies out of the sky, which use plasma as ammunition. Due to its massive size and its large hanger, it also acts as a massive aerial aircraft carrier, capable of launching out fighter-class ships, and also acts as a transport for other, smaller Assault and Aegis Contingents, airdropping them directly into the action from up high. Its massive wings can be used as runways if in need, and its not uncommon to see tons of Contingents out on the top of its hull, ready to fire upon any nearing enemies. The structure with the cannons on its top is the bridge of the bomber, and it has a Network Transmission Tower in it, allowing the pilot and those on board to be easily recovered through the Mechera Cyberspace. A Mechera good enough to be promoted to pilot one of these is a valuable asset, after all...So, these also act as mobile command centers, coordinating specific battles.
http://artnothearts.deviantart.com/art/The-Cloud-Of-Eden-137830376?q=boost%3Apopular+armored+core+3&qo=29Contingent Model-"FENRIS":Another Mechera superweapon, the FENRIS is a massive walking tank of sorts, sporting a plasma cannon as its main gun. Around the size of a small city, these things are also used to transport smaller contingents when needed, though not usually airborne ones. It has shields befitting a frigate on it, allowing it to stop a bit of damage from getting to it. On its bottom, underneath the 'head', its a building-sized laser minigun. The missile pods on its back fire off energy missiles, which can be replenished, while the smaller missile pod on the front fires a odd 'plasma missile'; the missile is actually just the homing device which uses small shields to control the direction of a packet of condensed plasma. Once these collide with something, the shields break, spreading the plasma around the impact site in a explosion. Like the ROC models, these have other contingents often up on the top of them, able to provide fire at smaller enemies closing in that it wouldn't be able to easily target itself. They aren't part of either of the Aegis or Assault Contingents specifically, but rather used with both forces equally, due to their balanced offensive and defensive nature.
This, but the turret actually looks like it can swivel to the front:
http://media.moddb.com/images/groups/1/2/1503/fm4-wanzer-zhuk.jpgAegis Contingent Model-"LEVIATHAN":The Leviathan Models are as large as the previous two, and as one might guess, these are intended for naval combat. A massive warship, it can submerge to protect itself from aerial attack, and even when not submerged, a lot of it is underwater anyways. Its equipped with guided torpedoes that can also be used as missiles, though they still have to be fired underwater initially. As with the others, it is also used as a transport, and Contingents can be found on its top, at least when its not submerged. Unlike the others, however, this one also doubles as a production facility, producing more Contingents, ammunition, and other such supplies as needed. Due to the thrusters on its bottom, it can move at extreme speeds for such a massive thing. While it can function without these, its mobility is severely decreased. It has hidden cannons on it that only come out when in use; these do not fire off normal ammo however. Instead, it takes in water, and fires that out of the cannons with a extreme amount of pressure, using the water to tear through armoring on opponents, though this obviously doesn't work when its submerged. It can repair itself when damaged, even underwater, and so if heavily damaged it'll usually submerge itself to begin repairs. Since the Mechera do not require oxygen, it can stay submerged for indefinite periods of time, and can stand some of the highest water pressures there are.
http://images2.wikia.nocookie.net/__cb20100720070834/armoredcore/images/0/0c/Stigro.jpgAnd now that those are good...
Assault Contingents-
Blade-Model:These are made with a special shield generator, designed to form a shield around its limbs. This shield is wickedly sharp, not rounded but instead geometric, and its used offensively to cut through opponents with kicks or stab them with punches. Besides that, its equipped as well on its right shoulder with a weapon that fires off energy missiles, on its left shoulder a new laser weapon that fires a consistent beam, designed to cut through armor on larger foes to get to the inner areas or dice farther enemies. Both of its arm-held weapons are made to take advantage of the shield generator's capabilities, but are guns as well as blades. The one in the left hand is a sniper rifle rail gun that fires solid-shell ammunition at high speed, while the one on the left is a shotgun of sorts that uses armor piercing rounds. Also on its shoulders are two odd looking structures; these are radar/whatever they use, with a large range, used to find hiding enemies or to detect if a large presence of foes are coming after them. While the shield is sharp enough that its a effective offensive weapon, its not the best defensively, and isn't used as such. It uses a lot of power to stop things, and drains the power from the Mechera at a higher rate than the power source can provide when used to stop things, and if used like that, it can drain the Mechera of all its power very quickly. It has boosters on its back, and the back and bottom of its feet, and also is equipped with the same anti-gravity field many other Mechera are equipped with, to allow it flight.
http://farm3.static.flickr.com/2447/3933074112_f48691d2af.jpgWing-Model:These are a newer model in the Assault Contingents, and are made with the same shield generator as the Blades, as well as the anti-gravity generator. However, these are also equipped with stronger boosters, and a 'overdrive' function to these boosters. This function gives them the ability to go at a even greater speed than normal, though for short periods of time. The two structures on their shoulders are a new weapon, that fires off bolts of electricity at enemies. Their other weapons are a device equipped to their right hand which refracts the shielding system, to turn the geometric blade into a geometric drill, then uses it as such, and on the left hand a version of the energy-encased solid-shell weapon used by the Fighter, Sniper, and Defender models; this one's projectile's dont move as fast as a Sniper's, but its a rapid-fire machine gun weapon. Due to its streamlined design, its very aerodynamic, and as such, its speed is extreme even when not using its boosters, which are located on its back. Due to the bladelike nature of its legs, its feet dont have any boosters. Wings are actually the mass-produced version of another Mechera Model, the Jet.
http://www.gundammodelkits.com/wp-content/uploads/2010/09/Armored-Core-OMER-TYPE-LAHIRE-Gun-Metallic-Ver.-Model-Kit-01.jpgJet-Model:These could be considered the prototype for the Wing Models, though they are still produced. They have the overdrive capability like the Wings, though not the same stronger boosters the Wings have. It does have the anti-gravity generator, however. Its most interesting function, though, is its ability to turn from a humanoid form into that of a Corvette Ship of sorts and back. Weaponry-wise, it has two high-velocity machine guns, and on its wings it has two missile launchers each that are usable in its human form. It also has the Blade's radar/whatever systems. Its boosters are on its back and feet.
Humanoid Form:
http://ravenrepublic.net/blog/wp-content/uploads/2010/01/XA-0900.jpgJet Form:
http://ravenrepublic.net/blog/wp-content/uploads/2010/01/XA-0901.jpgAegis Contingents-
Angel Knight-Model:This is a fairly simple model, named for its wing-like shoulder-mounted weapons. It has the same kind of energy shield system that Troop Models have on its left arm, and use machine guns with their right hands with bullets that have a high sopping power. The shoulder-mounted weapons are a set of recoiless rifles that can fire powerful grenade-like explosives. Its ammo-types are frag, napalm, explosive, and solid-shell rounds. Aside from this, they have exceptional vision, and heavy-duty armoring.
http://www.collectiondx.com/gallery2/gallery/d/462091-4/noblesse_oblige_front2.jpgProtector-Model:These are almost exactly the same as Troop Models, though they can weild a variety of weapons instead of any set armament. The only other differences than that, is that these have much stronger armoring, full-duty shields, are around a half a story bigger, and are slower. Due to the size difference and the stronger materials used in making them, they are stronger than Troops, and can lift obstacles Troops cant. The can use any weapon any other Contingent uses, just like Troops, and sometimes have shoulder weapons like Troops.
http://www.creativeuncut.com/gallery-07/fm4-wanzer-zenith.html(for the Troop stuff, its the second to the top for this post:http://shatteredplanes.com/index.php?topic=1085.msg14043#msg14043)
Finally, Im done. Yaaaaay!
