Steel and Sorrow: Rise of the Mercenary king - Chapter 64: Blood of brothers

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.

Crossing the sky, you don’t have a prominent background, you don’t have a grandfather ring, and you only have a little talent. What would you do?

Fortunately, Xiao Ming awakened the life simulator!

[Life Simulator is on:]

[You have lived an ordinary life. ]

[Extracting talent items]

[Currently available: Qinglian Earth Heart Fire, Melting Flame, Evil Poison Body]

[Please select one]

Every seven days, you can choose to extract one of the talent items from a simulation.

At this point, Xiao Ming began his ordinary life.

ps: The protagonist has a good talent and does not rely entirely on the simulator.

- Description from novelbuddy

Ryouma Takuma, a 39 year-old man with a hidden past, finds himself in a strange white room. There the gods tell him that he has died and that they are sending his soul to a different world; a world where magic exists. After living alone for three years his gamer soul loses common sense and starts toward crazy routes.

The person with the best martial art skill in the world, whose prestige is unparalleled. The head disciple of TianQing sect, the leading sect of all Six Great sects, and Jianghu’s number one, Ming ChangYan shaoxia.

During a decisive battle, he slipped and fell.

His ten years of cultivation was completely annihilated and reduced to a normal human.

Fortunately, he was lucky enough to have fate decide that his life shouldn’t end there, and he survived.

The doctor told him, “To gain back your cultivation, enter the palace as a concubine!”

In order to get the medical herb that was given to the emperor by the XiYu Region, the immortal’s grass, Ming shaoxia could only wear a skirt, apply makeup, endure the humiliation, suffer patiently, and join the palace drama.

Ming ChangYan: This shaoxia is shameless.

Unfortunately, just as he dressed up in drag and entered the palace, he meets the man he once picked up from under a mountain.

…..

Ming ChangYan: I was joking just now…..this is too shameless!

If I were to be found out by him, my (old) number one reputation would go down the drain!

- Description from Novelupdates