Reincarnated with a Military System in Another World - Chapter 9: Unexpected Threat Ahead of the Way

Originally born from a wealthy family, she ends up leading a vagrant life for fifteen years. However, when she is eventually found by her family, she falls into another devious plot and eventually dies tragically.

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.

A struggling businessman on the verge of bankruptcy finds himself drunk one night, only to wake up in the past—specifically, in 1943 London, amidst the chaos of World War II.This is an era of both immense danger and unprecedented opportunity. It is a time when the British Empire, once the unrivaled superpower where the sun never set, is finally witnessing the dusk of its dominion. Meanwhile, the United States is rising to claim the mantle of global leadership, reshaping the world's balance of power.This is the era where everything begins—where old rulers step down and new powers rise to take their place. This is the era where Pierre finds himself, an era filled with the kind of opportunity he never had before. A small, precious chance to rise, to become a giant, to seize the throne of power, to become a ruler, a world hegemon.

Zhao Yesui runs a private custom shop, and his job is to customize death for others.

On a certain day of a certain year, when he customized an exclusive death for a customer as always, he found himself involved in a game of death with no end in sight.

What surprised Zhao Yeshi even more was that, unlike other players, he seemed to be able to extract identities in the game?

However, as he extracted more and more identities, trouble also followed.

The NPCs in the game… chased after him in reality.

Not only that, but many of his identities are also known to everyone by word of mouth.

Such as Legendary Investigator, Unthinking Juggernaut, Archon of Fantasy Kingdom, Lord of Steam, Weaver of Fate, Loving Father, Lord of Death and Soul, etc.

And those women with prestigious titles also followed, the queen of the fantasy country, the ruling angel who called herself a bad woman, the immortal of Shenzhou who inherited the precious blood…

In this regard, Zhao Yejia could only deny it righteously, and packed up and ran away to escape the end of his own blood.

- Description from novelbuddy