The author of No Easy Day, a former Navy SEAL who was a member of the team that took out Al Qaeda leader Osama Bin Laden, contributed to the production of Medal of Honor: Warfighter. That's caused extra scrutiny of the game's realism.
A promo for the new Medal of Honor Warfighter on Origin seemingly confirms the existence of Battlefield 4. All references have since been removed from the service.
Tier-1 operating got a big facelift in the last two years. Medal of Honor: Warfighter follows up on the 2010 reboot with a new engine, a new (and fictional) conflict, and lots of bad people to shoot. So a few familiar elements return, too.