Master Zhan, Calm Down! - Chapter 147

Zhao Rong boasts super medical and martial skills, yet he keeps a low profile as an ordinary college student. When he gets his first part-time job, which requires him to pursue a school beauty whose boyfriend is a killer, Zhao knows his peaceful life ends.

Being re-birthed as a cell, Han Dong utilized the power of the Prison code and came into a parallel world where the Ancient Ones have awakened.

A steam powered civilization, horrifying subspaces, the Ancient King of the Eternal Night and strange monsters lurking outside the city.

The door of Destiny has been opened – Crusaders, Library, Control, Machinery and Mysticism would become the new growth system for human development.

The hymn of Humanity is the song of courage! The brave and dauntless Knights Regiments, riding into the world ruled by the Ancient King to seize back the freedom that belongs to mankind.

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“O, Hero!” With that cliched line, Kazuya Souma found himself summoned to another world and his adventure–-did not begin. After he presents his plan to strengthen the country economically and militarily, the king cedes the throne to him and Souma finds himself saddled with ruling the nation! What’s more, he’s betrothed to the king’s daughter now…?! In order to get the country back on its feet, Souma calls the wise, the talented, and the gifted to his side. Five people gather before the newly crowned Souma. Just what are the many talents and abilities they possess…?! What path will his outlook as a realist take Souma and the people of his country down? A revolutionary transferred-to-another-world administrative fantasy series starts here!

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.