Project Deca: Cold War

The Bonneville Salt Flats. A flat, barren wasteland of salt, where time and time again, land speed records had been challenged and surpassed by many a vehicle. Cars, trucks, motorcycles, no matter what they were, they used the vast open space of the Flats to test the limits of speed itself, and right now, two motorcycles racing across them were well on-track to break every world record the Flats had ever borne witness to.
The gunfight occurring between their riders, however, indicated that this was likely not intentional.
"Gott verdammt, what is your problem?!" Attai Zehn snapped as he traded shots with the other rider.
"My "problem" is you!" The man riding the other motorcycle shouted back. The motorcycle he rode was nearly identical to Attai's, save for the color scheme, but everything else about him couldn't be more different. He spoke with a distinct southwestern accent, and wore a uniform best described as that of a militarized cowboy. His hat somehow stayed firmly pinned to his head as the wind rushed through his brown hair. His green eyes were locked firmly onto his target, giving him a sort of supernatural aim with the futuristic, revolver-shaped gun he was carrying. "You damn krauts ain't gettin' your hands on this dimension so long as I'm here!"
"Was zur Hölle are you talking about?!" Attai grabbed the OS module out of his storage pocket dimension and slammed it into the far left slot of the DecaSystem's belt, creating a personal forcefield around him that blocked the other man's shots.
"You Nazis act like you're entitled to everything in existence," The other man spat. "But so long as the United States stands, you ain't takin' anything from anyone!"
"I am not a Nazi!" Attai growled as he summoned a card from the Cosmic Archives and placed it into the DecaCycle's card slot.
"Then why d'you have the same tech we nicked from the krauts?!" The other man summoned a card of his own and placed it into his own motorcycle.
They both activated their card scanners at once. The greens of the DecaCycle turned jet-black as the windshield grew into a significantly larger swooping shape with a mount shaped like an elongated carnivorous skull appearing at the front, evoking the appearance of an alien creature found on XLR8's home world.
Meanwhile, the motorcycle the other man was riding just straight-up turned into said creature.
"Looks like your version's a bit underdeveloped!" The man laughed as the two of them immediately hit Mach 1 and continued accelerating.
Moving faster than sound made any attempt at continuing the conversation out loud somewhat moot, so Attai switched to using telepathy.
"Look, technically this technology came from the Nazis, but I used it to fight the Nazis!" Attai projected his thoughts into the man's head. "I'm a version of their Project Deca experiments that was just finished enough to survive their purge of "failure" timelines, and I figured out how to erase the timeline where they finished their experiments and won the war!"
"Holy SHIT, Psychic Nazi!" was the immediate thought Attai got back. He rolled his eyes and tried poking around the man's brain for some basic information. His name was evidently Johnny Ringo, and he was a super-soldier created in a timeline where the US hired Nazi scientists to create America's own version of Project Deca; one of those "failure" timelines the Unendlich Reich erased before Attai undid the damage.
Figures.
"Again, not a Nazi, I destroyed the Nazis!" Attai scowled. "What part of that isn't clicking for you, Dummkopf?!"
"You really think I'm gonna believe one of you goosestepping kraut defected that easily?" Johnny internally scoffed. "Once a Nazi, always a Nazi!" 
"Oh, you are going to be one big pain in mein Arsch, aren't you?"
Johnny summoned another card and swiped it through a card slot located on the Kinetan creature's collar, replacing the saddle on its back with the upper turret of an M36 tank destroyer.
"General Sherman says hello!"
Attai floored it, accelerating rapidly enough that the G-force involved would have turned any ordinary human into paste. He pulled ahead of the creature with little issue, the performance of a naturally evolved organism paling in comparison to the optimally engineered performance of a machine, but for Johnny, this didn't pose much of an issue; for one, riding a living thing came with the advantage of the creature being able to steer itself in its dogged of the DecaCycle, allowing Johnny to focus solely on aiming. For another, the M36's standard primary armament was the 90 mm M3, an anti-tank variant of an anti-aircraft rifle.
The DecaCycle wasn't really created to outperform either of those things in regards to armor.
Attai attempted to figure out where Johnny was aiming in order to dodge, but unfortunately for him, sharpshooting was second nature for Johnny, and his muscle memory was doing the bulk of the work for him. Reading conscious thoughts and memories was one thing, but trying to interpret the unconscious motor signals of automatic movement wasn't quite as possible.
Moving as quickly as he could, Attai tried to switch out the XLR8 card in the DecaCycle for its Ridejacker counterpart, but he was unfortunately unable to move faster than the anti-tank round now barreling straight at him. The DecaCycle exploded, and while the OS module's shield absorbed the vast majority of what would have otherwise been a lethal impact as Attai hit the ground, the remaining kinetic force was still powerful enough that when his rolling body finally came to a halt, he was left with several broken bones and a collapsed lung.
Barely conscious, it took an immense amount of focus for Attai to use his psychic powers again, this time using his telekinesis to forcibly reinflate his lung and temporarily hold his broken bones together. Still clutching onto the Ridejacker card, he summoned the CataloGun Zwei. Eyes blurry and ears ringing, Attai fumbled trying to insert the card into the slot; just for a moment, mind you, but that moment was all Johnny needed. Another anti-tank round struck him dead-center right as he was about to pull the trigger, creating a massive explosion that obscured him from view. By the time the dust settled, all that was left were burning chunks of the DecaCycle and the charred remains of the CataloGun Zwei.
"Whoa there, Nelly!" Johnny pulled back on the reigns of the Kinetan creature, prompting it to stop running and slide to a halt a few meters away from the burning wreckage. "We got 'im, girl, good job." He patted the creature on the top of its head a couple times before leaning over and pressing a button on the collar, transforming it back into his motorcycle as the card he had inserted into the reader was ejected.
Dismounting his motorcycle, he went over to the wreckage to make sure there was nothing left to double-tap. After a thorough investigation of the crash site, he attempted to pick up what was left of the CataloGun Zwei, only for it to crumble away in his hands.
"Welp, there goes any chance at gettin' anything useful outta this." He tsked. "Lab boys'll probably be upset, but I can't say I'm too torn up about it personally. Y'ask me, we're already relyin' on German tech too much."
His motorcycle honked at him a couple of times.
"Now don't you start with that." Johnny walked back over to his bike and mounted it again. "The tech ain't bad, I've just got some pride as an American. Besides, the German's mighta designed you," he leaned over and tapped on the bike's engine, "but Harley-Davidson made ya real. Now come on, let's get back to the carrier. We've got a job to do."
----
"So...is there any particular reason why you two are on the roof of our Gazebo?" Divara asked.
"We're pretty sure Aeron's hitting up this timeline next." Theo-4 replied with a grunt. "You two are the only people we know he couldn't kill if he comes after us first."
"I thought you were Aeron." Millennia raised an eyebrow.
"I got that fixed, remember?" Theo-4 replied. "Unfortunately, that ended up detaching me from my home timeline, and when your genius partner there reset things to undo her own fuckup, the universe ended up spawning in a new one to replace me."
"Well, damn." Millennia whistles. "Yeah, probably fair to let you hang here for a bit, then."
"As for being on top of the gazebo specifically, it's just the best view you guys have of the valley." Nova-4 gestured to the vast spread of land behind her. "Lets us keep an eye out for anything big happening."
"Like what?"
Millennia's question was answered by the sound of a massive explosion going off nearby. She immediately teleported over to the source of the noise to investigate and found a battered Attai laid out on the ground, barely conscious and with his Multitransference Suit in tatters.
"Oh, holy shit!" She quickly knelt down and placed a hand over his chest, reversing his body's personal timeline with a quick flash of magenta temporal energy.
"Millennia, what's going on?" Divara caught up with her, followed shortly by Theo-4 and Nova-4.
"Oh, hey, it's that German dude!" Nova-4 snapped her fingers as she recognized Attai.
"Attai, what happened to you?" Millennia asked, offering Attai a hand. "I haven't seen you that banged-up since the temporal backlash buildup!"
"Got hit by two anti-tank rounds in a row." Attai grunted, reluctantly accepting Millennia's help standing up. "So, you know. Been better."
"Anti-tank rounds?" Millennia raised an eyebrow. "You been spending your weekends like I used to?"
"I'd ask what you mean by that, but knowing you, I'm pretty sure I don't actually want to know."
"I am a kinky little weirdo." Millennia snickered.
"Yeah, see, that's already TMI." Attai looked unamused. "Anyways, you remember how the Unendlich Reich wiped out every timeline in their universe where Project Deca didn't win them the war?"
"Kinda hard to forget." Millennia sighed.
"And you know how in a majority of universes, the United States recruits Nazi scientists for their research after World War 2?"
"Let me guess, you found an American version of you and got dunked on?" Theo-4 interjected.
"More like I got jumped." Attai scowled. "The guy showed up out of nowhere and assumed I was a Nazi as soon as he saw the DecaCycle and clocked the accent. Got into a gunfight with him. He's definitely more skilled than I am, but I was more or less able to keep up until he whipped out the tank gun."
"Well, if there's one thing Americans are known for, it's being overkill with ordnance." Theo-4 tsked. "Next time try beating him in a field where you hold the advantage, like doing war crimes or having no sense of humor."
"Beiß mich, du hurensohn."
""War crimes" is a low blow, but he does kinda have a point with the "no sense of humor" thing." Millennia hmmed.
"All jokes aside, this could be an issue." Theo-4 grunted. "Post-World War 2 America turned real fucked-up real quick. If they're sending their version of you into other timelines, at best they're trying to make sure there's no communist version of you, and at worst, we've got a multiverse-scale MK Ultra on our hands."
"MK what?" Divara interjected. "What is that?"
"MK Ultra was a series of secret experiments the CIA did back in the day to try and develop some form of mind control." Millennia answered. "A lot of it was basically just mixing LSD with new and innovative forms of torture, mostly on unwilling and unwitting human test subjects. The specifics vary from timeline to timeline, but that's the general gist of it."
"Okay, wait, I can understand Divara not knowing about it, but how do you actually know about it?" Attai gave her a suspicious look.
"Attai. Come on. Let's be so for real right now." Millennia placed her palms together and gestured towards him with a flat look. "You know me. You know what I'm about."
"Unfortunately."
"I don't get it." Nova-4 looked between the two of them, confused.
"Good."
"Actually, fun fact: Chronians process LSD a bit differently than humans." Millennia said. "It acts like more of a stimulant than a hallucinogenic, and let me tell you, I have never felt as good before or since; only problem was the withdrawals. I was basically trading two hours of heaven for three days of hell every time I got dosed, so, uh...I don't know, don't do drugs, I guess? I kinda forgot where I was going with this."
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