Years ago, Sledgehammer Games was working on a third-person Call of Duty game set during the Vietnam War. But it never came to be. A developer who worked on the game, Bret Robbins, shared some new details on the project in an interview with MinnMax and also confirmed that Sledgehammer did, indeed, start working on Call of Duty: Advanced Warfare 2 before shifting gears.

Robbins said the unannounced third-person Call of Duty game was "almost like an Uncharted-meets-Call of Duty idea." The game never materialized, though, because Sledgehammer got pulled in to help Infinity Ward finish Call of Duty: Modern Warfare III after the major shakeup at Infinity Ward that saw its top bosses get fired for alleged insubordination.

"We did a prototype for it and we made a demo. It was cool. It was fun. I think someone should go make that game someday," Robbins said.