Infinite Range: The Sniper Mage - Chapter 1 - - The Human Cannon

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.

A polite and lethargic boy was reincarnated in another world as a vampire bishoujo.

As the youngest in the sect, Xie Chi, who has the best talent but only physical superhumanity, went down the mountain with a heavy responsibility.
The second week after going down the mountain, the brothers and sisters at home received urgent help from the younger sister: Brother and sister, the female ghost I raised has eaten several evil ghosts today. Will she have a stomach upset?
Brothers: ? ? ? Junior Sister! Say it again, what are you raising?
——————
Author’s Note:
①: Xie Chi x Lin Xia, Natural Black x Natural Stay
②: Spiritual direction, including live broadcast, sweet text, not scary, really
③: Welcome to catch insects but refuse to be strong, the pits are guaranteed, welcome to collect ducks
Also known as “Ji you are too beautiful” (not really)

Content tags: Spiritual Gods and monsters Sweet text Live broadcast Metaphysics
Search keywords: Protagonists: Xie Chi, Lin Xia ┃ Supporting roles: Pre-received text “The Queen is a Cat” ┃ Others:

- Description from novelbuddy

The Special Investigations Unit is a covert organisation that no-one in the city knows about, dedicated to investigating bizarre occurrences beyond the comprehension of the living. The Chief Zhao Yunlan isn’t a simple guy either, being the inheritor of the Guardian Order, he has always been a righteous conformist, excelling between realms of the living and the dead. While investigating a school suicide case, Zhao is attracted to the calm and reserved Professor Shen Wei, but the Professor seems to be rather fickle towards him…

- Description from Novelupdates