A "friendly" alien race makes First Contact, secretly, with the governments of Earth. They are called the Darhel, and for nearly two hundred years they have pressed by a race called the Posleen.
Now, the situation has changed. The main Posleen advance has been disrupted by the arrival of Shinogi and his U-men, fresh from the OA universe. After a brief confusion ("this isn't the wormhole to Damascus") Shinogi decides they traveled through time and/or to a parallel reality. Now he is making his way to Earth, raiding the GalFed planets in his path, sometimes enslaving the local population long enough to produce specific needed spoils. He will arrive within 3 years, looking to conquer mankind and lead them to the glorious future he has seen. He could get there faster using Federation ships, but doesn't like traveling unarmed, or resent the waiting. A (reduced) Posleen force will be just 18 months behind him.
The good news for Earth is that until they can begin recruiting humans from this time period, there are very few U-men, only 144,000, and they don't have access to anything like their normal infrastructure, something Shinogi means to change. The bad news is that the U-men are very, very smart, with a passing familiarity with Earth history (they may not know if the Cold War is over by this point, but they can point to China on a map) and a considerable wellspring of knowledge on military tactics, particularly as relates to civil insurrection and guerrilla warfare. To say the least, fighting them is going to be very different from fighting the Posleen.
The U-men are a fanatical cult of super-sophonts. If you don't know OA and haven't been keeping up with my thread on it (shame!) That means they're humans whose muscles, bones, and assorted squishy bits have been replaced with carbon-boron nanotube duplicates. They are (at least) 10,000 x stronger than any human. They do not need to eat,drink, or breathe. They laugh at bullets and conventional explosives, or really anything that isn't antimatter or at least nuclear. They can swiftly regenerate from any injury not immediately fatal. They can see IR-UV, and have exceptional night vision. Their hearing isn't quite up to the standards of the best of the animal kingdom, but it's not far behind and very, very good at determining precisely which direction and distance a sound came from. Their sense of smell is on par with a dog's.
Their intellects are also enhanced, albeit to a far lesser extent than their physical abilities. They think very quickly, and their reflexes are probably at least twice as fast as a trained unenhanced person. They have boosted learning and coping, creativity, flawless memory, and no fear.
Their weaknesses are few. They require a reliable power source or they freeze up. They are 'weak against' nukes, antimatter, Rods from God, and very intense levels of cosmic radiation. But so is everyone else. They also overheat relatively easily compared to baselines. They have cooling systems far in advance of what nature gave us, but also a lot more waste heat to deal with.
Their leader, Shinogi, is a transapient. He looks like a walking squid, but he is thousands of times quicker, more precise, and generally smarter than well, anyone in this universe I suppose. He's even more capable within his specialties, management and propaganda. He knows how to produce technology thousands of years more advanced then ours, and in some ways superior to the Galactics, but is frustrated by his lack of materials and manpower. He floats gently through life in his personal utility fog, a vast cloud of nanites under his mental control, and anyone within his immediate reach can be disarmed, restrained or killed in an instant by his wishing it so.
For simplicity's sake (OA has as many and as inconsistent weapons as 40K) and because it's something they'd do, we'll say the U-men "commandeered" 5 globes worth of Posleen ships, weapons and general tech. They can be very practical when they need to, and I'm sure they'd be delighted by the tenar's autotarget capabilities (if less so of how it makes the rider a target) and the sheer destructiveness of HVMs.
We'll also say that since Shinogi wants to build a techbase that would allow for vast-scale nanofabs that would allow him to build the technology he's familiar with, he'll want to capture as much of Earth's infrastructure intact as reasonably practical. That and a firm expectation of victory will stop him from dropping rocks.
So, how different will the Galtech conference go if they're arming up to meet U-men instead of Posleen? Who will win, Iron Mike or Shinogi? Will the winner be ready for when the Posleen show up a bit late? In the land of the batshit-insane techno-wank, who is king?
I'm really glad Washington spends billions of dollars each year on weapons: bombs, missiles, fighter jets, missile that shoot down missiles, and of course, nuclear bombs.
I'm sure the goverment will use these things in a constructive manner!
Piety, Obedience, Poverty, Chastity and Kung-Fu. (SoB oaths, Knight Errant)