BTTH: Starting from Capturing the Goddess - Chapter 110 - 114: Her Majesty’s Unmatched Might

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.

His name was 25. On Avalis, he was just one of many tasked with fulfilling missions for Earth’s people. This time, he was given a simple one—live as Zeno Han and have an ordinary life.Easy. Or so he thought.The moment he took over Zeno’s body, someone shoved a script into his hands. “You’ll be perfect for this role!” And just like that, he was on set.[Fame Meter: Unable to Measure. Off the charts.]Doctor? Check. Pilot? Check. Eunuch? …Regrettably, check. Every script forces him to relive past missions, and somehow, he’s nailing every performance. Now, the industry wants to make him a star, but can he still complete his mission? Or will fame—and the terrifying unknown of failure—be his final curtain call?

[Additional tag: GL, Yuri, Only Wholesome romance, Harem, Slow romance, Academy, Fluff, Lighthearted, Overpowered Protagonist and Love Interest][Update Daily]Seven Witches. Seven Sins. Mel always found the apocalyptic Gacha World of the 'Witchhunter's Howl' quirky and confusing. The Tragic Witches. The over-powered Saintess. The Bad Ending. And the twelve thousand Dollar she spent on pulling PNG waifus. Really, another salary emptied? Aw, she still hasn’t bought the new, limited merch yet!But now, transmigrated back to the world 15 years before the apocalypse, Mel had a new mission: as the Witch of Lust, she had to seduce the six other witches, plus the Saintess, to prevent the end of everything.Now if only the Kingdom would stop mistaking her for a terrorist, her childhood friend-turned-lover Envy would chill on the yandere vibes, and the Saintess wouldn’t tease her every chance she got...“Ah... I want Miss Pride to be my chair at my tea party...” Mel sighed, just another normal thought on another not-so-normal day.

When gods gather, lightning will strike and the earth will move. Immortals! Which of the numerous way to immortality should one follow? Immortals are hard to seek, but why should immortals hide? Heaven has no mercy, but humans have emotions, and these emotions hinder the road to longevity!