MTL - Fairy Tail: The Nameless Grim Reaper - Chapter 299 Acclaimed knight, overwhelming strength――

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.

During the Second World War, Kyle looked at Captain America standing straight and proud before him. Suddenly, a series of skill cards appeared.

「Pistol Master」

「Martial Arts Master」

「Shield Defense Master」

「Super Soldier Serum」

Which skill card do you wish to extract?

“Wait… what? This golden finger… you must be pulling my leg! Not only skill cards but I can also extract super-powered skills like the Super Soldier Serum? Mother of God… what is this?!”

- Description from Novelupdates

“Shameless Xia Ping, not only did you steal my martial arts manual and medicinal pills, you even took my fiancée! We’re not finished!”

As a salted fish, Yun Su, who never pays in games and always relies on prostitutes to fight Shenhao players, wrote down his 20th birthday wish on a notebook with trembling hands: immortality.

When I woke up, my dream came true, but I almost cried. Is the world of cultivation so cold?

- Description from novelbuddy