I See the Aura of the Great Emperor in All My Disciples - Chapter 811 - : Illusory Sword

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.

In a world where dungeon runners rise to fame by mastering their classes and conquering impossible threats, Alexander was never meant to be part of it. No class. No path. Just a quiet life.When a mysterious portal drags him into a hidden realm known as his Inner Path, Alexander unlocks a class no one has seen before: Beholder. There’s no fanfare. No guidance. Only eyes that see too much, and power that threatens to unravel his mind with every use.Now, trapped in an abyssal dungeon that reshapes itself around eldritch laws, Alexander must survive alone.But with each victory, his vision sharpens. His spells twist reality. And the deeper he goes, the more the world outside should start to worry.Because when he returns-They won’t be able to look away.

In the wealthy circle of the third district of the Federal Empire, everyone knows that Su Wan, the daughter of the Su family, has loved Huo Yichang for many years.

The two families are rightly matched, and they were childhood sweethearts, but they got married today, but the groom ran away!

Everyone was sympathetic or waiting to see the joke, but the bride Su Wan was very excited!

As long as this wedding is completed, she will not have to be forced to marry, and she will have an explanation to her grandfather.

As for the groom gone? Then change it!

Then Su Wan bumped into a man at the corner of the corridor.

The man was extremely handsome, with fluffy ears, a big fluffy tail, and a pair of big wet eyes, looking at Su Wan expectantly.

Su Wan immediately decided that it was him!

Pull people and run away, the mastermind registers for marriage, and goes through the wedding cutscene, all in one go!

When Su Wan thought that the bridal chamber could be skipped, it happened that this person exploded.

When she woke up, she found that the person she was crying and hugging her dear last night was actually the first commander of the empire?

Su Wan: Run away, run away!

But one month later, at the opening ceremony of the Imperial University, Su Wan looked at the specially invited Commander, who was specially invited on the podium, wearing a dark blue special military uniform, with an ascetic and cold face, and suddenly fell silent.

Gu Jue: I heard that someone took advantage of my distress and dragged me into marriage, and even comforted me?

Su Wan: I haven’t heard of it, it might be a rumor!

A smaller version of ‘Gu Jue’ jumped out next to him: Ma Ma, haven’t you heard of it?

Su Wan: …

- Description from novelbuddy

Galio, valiant reincarnate, is on his last life before he is allowed to take the hand of the beautiful Goddess, Tallia. Four hundred and ninety-nine lives worth of knowledge is given to him as a reward, along with the world he reincarnates to.

A world only known by women, where the concept of man had never existed, and the world is made up of twelve islands holding twelve primary races. These women have never known childbirth, periods, or the leer of a man.

Galio will enter this world filled with wonders that only men would ever dream about, but he has no memories. He will have to make his way, helping some along the way to help grow his Karma System.

Get ready for an R-rated journey of epic proportions and women of all shapes, races, breeds, and sizes! From Angels that moan heavenly melodies to the nine-foot-tall Amazons with weaves between their legs, and so much more!