Crimson Vale Academy - Chapter 14: Calculated Risk

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 the mysterious MMORPG 【ExoGenesis】, the extraordinary age of transcendence has arrived on Terra. Tristan is reborn on the very day the game launches, awakening an SSS-level talent: the Sniper God.[Sniper God (SSS-Level)]- Effect 1: All ranged attacks are guaranteed to hit, and the damage type is changed to true damage.- Effect 2: For every meter of distance from the target, damage increases by 10%.With such an overpowered talent, Tristan’s choice is clear—he becomes an assassin!With deadly precision and the ability to strike from miles away, Tristan proves that an assassin doesn’t have to fight up close.

[Simulation] + [Isekai] + [Goblin] + [Harem]After a long sleep, I awakened in a new life—as a goblin. Weak and insignificant, I found myself reborn as the lowest creature in a world filled with hostility and danger. But from the shadows of this cruel world, a silent rise begins...

In a world where strength reigns supreme and only the strong are revered, conflict and injuries are commonplace.