Americans & Demon Slayers vs Demons

Description: A large base of American Soldiers and Marines in a forested area in Japan is celebrating independence day. When all of a sudden a bright light transports both the base and the troops to 1912 Japan. How will the modern Americans help out the Demon Slayers in taking down Muzan?

Who's the main characters?:
A platoon of both Soldiers and Marines.
The Kamados
Zenitsu
Inosuke

Will the Americans teach the Slayers modern combat?: Yes.

Do some of the Americans like the Hasihra?: Most of the troops don't know who most of the characters are due to not reading the manga or watching the anime.

Will some characters be shipped with the Americans?: It better be legal.

Why does it starts at 1912?: A certain family