The Wrong Way to Use Healing Magic - Chapter 2Vol 3.

She was reborn back to 11 years ago, when everything was fine, her family was still alive and she had not experienced the pain of destruction. Since she had the chance to restart, she decided to seek revenge on those who had hurt her! She would also leverage her knowledge and strength to lead her family to a prosperous life. However, she has a regret: despite being reborn, she still ended up marrying him, a man who was difficult to approach...

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.

The first time she traveled abroad, she encountered the tragedy of a missing plane. When she woke up, she transformed from a sunny girl into a Young Madam!On the very first day after waking up, he tormented her for an entire night, and then he planned to steal her heart! How could there possibly be such good fortune in the world?She swore to escape from his grasp.“Young Master, the Young Madam has run away again...”“Damn it, launch a city-wide search within 24 hours!”He cornered her against the wall: “What exactly do you want?”“You're so disobedient. It seems I'll have to find a way to tie you to me forever...” He said mischievously, gently stroking her flat stomach.[The main text has been completed.]

He died on the wedding of the girl he had a crush on, after a long and successful career. After convincing Yama to send him back to the world, he decides to fix the areas in which his life went wrong. Realizing the lack of love and romance in his past life, he sets out to conquer the hearts of various women.