You say that… but.
Battlefield 1, 3, 4, hardline, V
PayDay 2
Battlefront
Wargames
RimWorld
GTAV
7 days to die
L4D1, 2
Arma 3
Space Engineers
All have Trainers.
Given some of these games are to concentrate on the single-player like Wargames. but the games with multiplayer sides like SE, Arma, and GTAV are really nasty.
I fully understand what Crazy is asking for. EfT is a VERY unforgiving game. and the learning path is usually blocked by the game pushing you to a unsaving offline mode (means it doesnt save progress) or a hell-on-earth ultimate survival combat sim in online mode. where one you can have plenty of time and no worry of fighting other players, so you can pop your gun freely. The other is SEAL Team 6 in Pakistan levels of stealth needed to keep yourself alive. So online mode is not suitable for such a task.