Lord Xue Ying - Chapter 1304: Great Emperor North River

A scientific genius named Thomas Harrier was transmigrated to an imperial prince body after a car accident that took his life. He found out that he is in a world similar to our own with a timeline akin to early twentieth century. The body that he is occupying was the imperial prince of a failing empire who suddenly rose to power after a successful assassination attempt of his father. Unaware that the attack is just the beginning of what is to come. He faces many challenges throughout. Will Thomas Harrier be able to live his second life in peace while running an empire and getting it back to its former glory? Or will he succumb into a conspiracy lurking within the country's borders?

Expect some:

Cold war era techs.

Super battleship with advanced electronics, propulsion, and fire control systems?
Helicopters?
Missiles?
Modern medicines and equipment?
AC-130?
A nuke?
Challenger or Abrams or Leopard?
F-4 Phantom or MIG-21?
Colored TV's.

Everything!!!

PS. Cover not mine, I just found it on google.

I died the way I lived—cheap, broke, and naked.One freak laptop accident later, I wake up in my younger body… back when I still had hair, hope, and zero rent money.But this time, I’ve got something else.A system.One that talks. One that levels me up.One that feeds off... intimacy with women carrying “Yin-rich energy.”And the first target?My mysterious landlady. She’s mature, curvy, and definitely hiding more than just a killer figure under that robe.To grow stronger, I’ll have to seduce, satisfy, and survive the “Dual Cultivation Trials” the System keeps throwing at me—each more insane than the last.It’s time to become the strongest lewd cultivator in the modern world.And I’ll start... by paying my rent.Tags: romance | reincarnation | system | r18 | comedy | harem | cultivation | slice of life | fast paced | urban | academy | milfs | older women

That year…

Zhou Yang, an honest man who just got his driver’s license, crashed the camera of the Caotai crew. With no money, he could only sell himself to the crew to do odd jobs. I originally thought that if I worked until the film was finished, I would be able to regain my freedom.

However! ! !

When the swindler director ran away with the assistant director, and he was almost regarded as a fraud accomplice by the long-legged beauty investor, the honest Zhou Yang was dumbfounded.

“I’m on top? What do I take on top?”

“God, my major is electronic information technology. I’m just connected to wires. I don’t know anything about making movies…”

“…”

- Description from novelbuddy

A man who was once called the world strongest agent ended up becoming a teacher after his retirement to train the new generation of agents. After many years of training his disciples, he is killed at the age of 60 by the ploy of a secret organization and was reincarnated in another world with all his past memories.Though he was surprised by the magic and the strange species of that world, he adapted very fast to his condition as a newborn and took advantage of it. He acquired special magic and gained a massive amount of strength thanks to his tight discipline in order to reach his goal: resume his career as a teacher which he left halfway through in his previous life.This is the story of a man who based on the memories and the experiences of his previous life, became a teacher who travels through the world with his new students.