The Call of Duty series has often prided itself on its realistic take on military warfare. However, as the years have gone on, they've veered away from a realism and moved more towards the Hollywood blockbuster territory seen in Call of Duty: Ghosts and its sci-fi elements. The reason for that, according to Activision CEO Eric Hirshberg and Infinity Ward executive producer Mark Rubin, is because they can't completely replicate the war stories told directly to them by military veterans.
"There an enormous amount of appreciation for what [veterans] do," Rubin told Game Informer. "In no way do we feel we are a representation of what their lives are like. We are trying to be a cinematic movie experience based on authentic equipment and authentic experience. A lot of the stuff that we show in the game has been done by someone, but it's not a representation of what they do or it's not an equivalent in any way of what they do. We're just trying to make a fun movie."
This is clearly a different approach than the one EA took with Medal of Honor.
Though it's a fictional experience, Hirshberg does note that veterans are included in the development process. "We try to make our games authentic, we try to get the feel right. And then, also, there are guys who come in and do our mo-cap for us and become actors in the game, do the stunts in our commercials, and certainly, there are some high-level consultants who have some harrowing stories that have been some of the inspiration for some of the missions and levels in our games."