I'm the Mysterious Leader of the Salvation Organization - Chapter 509:

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.

When the entire world learned of the future.Some worshipped me like a deity, while others regarded me as a demon!Some tried to persuade me to switch allegiances, while others prayed for me to trek the invincible path once more.Daoist magic, martial arts, prodigies, goddesses, demonesses, immortal emperors... they were merely supporting characters on the stage.And I still remained the center of the world!

An RPG gamer who played the realistic VRMMORPG ‘The Amber Sword’ for years, finds himself teleported to a parallel world that resembled the game greatly. He takes on the body of an NPC who was fated to die, and with the feelings of the dying NPC and his own heartrending events in the game, he sets out to change the fate of a kingdom that was doomed to tragedy.

- Description from novelupdates

In a vast fantasy world where countless dangers lurk for humans and demi-humans alike, no creature is more fearsome or powerful than the Dragons, proud, intelligent beasts who stand at the very peak of existence.Dragons do not fight for kings or armies. They are the purest manifestation of nature’s fury and brutality, beings born to stand alone. Yet even such creatures seek a connection, a single partner chosen only once in their lifetime, bound through a unique Pact that links body and soul as one.Those chosen are no ordinary individuals. Dragon Riders soar through the skies atop their mighty companions, dominating land and air alike with powers of overwhelming magnitude. Thus begins a ruthless race between peoples and nations, each striving to secure the loyalty of the most powerful Dragon Riders the world can produce.This is the story of Theo, a noble whose family was brutally murdered, leaving him orphaned and alone as a child. Now a young man, his gaze turns toward the Royal Academy of Dragon Riders of the Empire of the Four Kingdoms, for nothing could serve vengeance better than a creature that embodies the raw fury of nature itself.But while Theo’s steps are driven by revenge, his journey will be filled with both intriguing allies and cruel enemies. And in his search for a battle companion, he will discover something far more precious, because the same mythical beast capable of terrorizing the skies and the land also holds another side, one far more unexpected than anyone could imagine.