Global Superpower: I Control All Elements - Chapter 30 - Cross-Level Battle Two Stars

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.

Hasami Tatsuro and Yashiki Ai, two ordinary teenagers, experienced an earthquake while on the way home from school.The earthquake cracked space and transported the two to another world.Landing in an unknown forest, the two initially began to grieve. However, unbeknownst to them, a system had installed itself into their bodies, granting them the ability to gain skills and statuses.Hasami Tatsuro obtained the “Level Eater” skill. “Level Eater” allowed the host to devour others’ levels/skills and make it his own.Yashiki Ai obtained the “Valkyrie” skill. “Valkyrie” allowed the host to obtain and use any offensive skills from different classes, without the need to specialize.With their cheat skills and teamwork, they managed to venture out of the forest and explore the new world.This is a story of two ordinary kids.

Traversing into a Fantasy World, Watson became the youngest son of a run-down baron, ranked eight in the family.

Lin Fan was transported to another world, into the body of a normal disciple. Given the environment he was in, Lin Fan faced the risk of being killed at any time. However, something was out of place.