Toaru Majutsu no Index - Volume 21, Chapter 7: An Angel Massacring from the Heavens. MISHA_the_Angel_“GABRIEL”.

On her wedding night, framed for infidelity and to be burnt alive?Chu Qianli laughed heartlessly, “I've already written the divorce letter for you, farewell.”Feng Yexuan seized her firmly, his cold and sinister voice cutting through the air, “Thinking of leaving? The only way out is over my dead body!”…The Divine Doctor unexpectedly transmigrated into the unlearned Princess of Prince Xuan, and Chu Qianli only wanted to live an easy life without any ambitions.But she inadvertently caught the attention of the obsessive and insane Prince Xuan and accidentally got spoiled to the heavens!One day.The officials approached with gloomy faces, “Prince, the Princess is causing chaos in the Golden Hall again, please reassert your authority!”Feng Yexuan knelt before his wife with a thud, presenting a “taming husband whip” with both hands, “Lili, I've ripped their mouths for you, can you be a little gentler?”

Seong Eugene, a student at Gukcheon University, is recognized for his latent potential as a hunter but shows no signs of awakening by the age of 21.One day, his intense desire to awaken triggers his latent abilities, and he awakens with a new smartphone app.He invests five points to increase his physical attributes, specifically enlarging his penis to 16 cm. As he explores his abilities, he discovers he can conduct random draws for items and skills, acquiring several items and a complete recovery skill. His unique ability allows him to enter fictional worlds, and he decides to test this by entering an AV film he watched a week earlier, SV-7495.

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.

The orphan Sun Chan was abandoned by her first love. Her foster mother and sister sold her to the village drunkard, where she endured endless torment and ultimately died from exhaustion in the cornfield. After awakening, she returned to being seventeen years old. She vowed to leave the village this life and carve out a new world for herself! Family, friendship, and love, she will strive for them all. Hey, soldier brother over there, why do you keep looking at me?