Peerless Martial God - Chapter 2251: Another Life

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.

It is an era of artificial superintelligences, interstellar travel, gene medicine, and virtual reality worlds. Far into Earth’s future, 15-year-old Gu Ding is a student of Cerulean Military Academy by day, and tavern waiter by night. His ambition: Become the space pirate with the highest bounty offered by the Universal Federation Government. With the help of Neptune, a neonate super-intelligence, Gu Ding finds himself thrust into a galaxy of shadowy organizations, political underdealings, and otherworldly forces that lie beyond human comprehension…

“One accidental signature, and now the legendary Shadow Queen is living in my house... wearing my T-shirts and refusing to leave! She claims to be cursed with laziness, but why did I just witness her destroy a monster with one finger? And why does she keep looking at me like I’m her next target? Someone help—I’m not ready for this kind of responsibility!”

– The planet [Earth] has entered the abnormal state [Apocalypse].

– You have failed in saving the Earth. The Authority, [Vintage Clock (EX)] rewinds the world’s time.

For Yu Jitae, it was a message he had seen many times.

It was tiresome.

It would have been great had he died with everyone else.

But he couldn’t, for his authorities that made him the strongest existence, brought him back in time whenever he did.

And even with his strength, he couldn’t protect the broad earth against the maddened dragons.

– The world’s time will soon begin.

As the clock resumed ticking in the direction it should, his 7th iteration came to a start.

Fortunately, he finally had a gist.