Reborn at Boot Camp: General, Don’t Mess Around! - Chapter 3500 - : Connections

A mortal teenager strayed into the immortal way because of an accident, struggling on the road of seeking immortality.

Immortal Road is difficult to climb to the sky, in the face of numerous obstacles, his desire to seek the truth is still unabated.

Looking back again, the green mountains are still there, so the old is boneless.

- Description from novelbuddy

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.

Shocking! The Tyrant's Group Pampered Baby Is Heavenly Dao's Own Daughter【New Book “Exile? Extinguish the Kingdom? She Empties the Treasury and Rebel with Her Baby” Released】【1V1, Sweet Pampering, No Abuse】Bai Xilie, the tyrant who founded Great Chu, accidentally lost his only daughter during the chaos of war! After finding her again like a madman, he instantly transformed into a daughter slave, showering her with love!Unfortunately, not long after Great Chu was founded, the national treasury was empty, and rebellions broke out everywhere, with remnants of the former dynasty surfacing one after another!Bai Zhi'er, as the own daughter of Heavenly Dao, was utterly fearless: “Father, don't be afraid, I've got this!”Natural disasters and human calamities? All resolved with Jinli's fortune!Fake princess vying for favor? Slap her face swollen!People's literacy is low? Establish the Wen Mansion to bring about an era of flourishing scholarly contention!However, Bai Zhi'er always remembered Heavenly Dao mother’s advice: transform five major villains to stabilize her father's throne!…Not long after, each villain more ruthless than the last joined the team of the great tyrant, pampering the little princess Bai Zhi'er to high heaven!The Princely Heir skilled in both poison and medicine: “Saying Zhi'er is a fake princess? Do you not want your eyes for my medicine?”The temperamental Third Brother: “Who bullied my sister? I'll lead troops to flatten your whole family!”The reborn chief minister of nobility: “Bai Zhi'er is my sworn sister, she must not cry, or I'll have you die!”The Emperor from an enemy kingdom as the godfather: “If you are wronged in the Chu Kingdom, we from Great Qin will exact double return for you.”Four villains are all settled, only the last one remains, and he doesn't want anything, leaving the little one at her wit's end!The handsome, paranoid Demon Lord youth smiled unrestrainedly: “Zhi'er, the world is vast, yet aside from my embrace, you're not allowed to go anywhere, come here for a hug.”

DESTINY GAMES. It has been 85 years since Earth-11 became aligned with Yggdrasil and 73 years since Icon became the first demigod from Earth. Icon, as the first demigod, was privileged to weave the thread of fate for everyone. He was supposed to cut off Yggdrasil and free Earth-11 from the grasps of the other Earths and their god kings. That’s why everyone helped him climb the tower of Destiny. But instead of ridding earth of Yggdrasil, he turned the destiny of mankind into seven rings of immortality. The first ring was for the immortality of power. The second was for the immortality of the knowledge. The third, fourth, fifth, and sixth were for the immortality of the mind, energy, body, and soul. The last ring, the ring of the paragon, was made to rule them all. Icon kept the ring of the paragon for himself and became a dictator. He ruled with an iron fist for many years. His was a reign of terror. But he was eventually vanquished by the collective effort of the world. It has been 62 years since then. Icon is no more, but the damage he had done still remains. Earth-11 is still connected to Yggdrasil. The deadly games of the Tower of Destiny still remain, and the fight for the seven rings of immortality still continues. Kelvin Thorn has just awakened his ability. It came at a good time too since he is running for his life. The ability he awakened saved him, but it came with a cost. He must climb the tower of destiny under the witness of the whole world and accumulate destiny, or he will die. His situation is not unique. Everyone that awakens, which is mostly everyone, must climb the tower of destiny. It is one of the curses that Icon left behind before he died. But Thorn is different because the seventh ring found him. The tower of destiny is where everyone granted power by destiny, be they humans, non-humans, or otherworlders, must fight in games of might, skill, and knowledge to gather the power of destiny. They will either die or eventually overcome death. Kelvin will be one of the latest in the line of billions of others in this struggle.