The Unnamed Military Shooter appears to be a somewhat realistic FPS game developed by Croteam for the now-defunct game publisher Gamecock. How the actual gameplay would work is unknown, as the game was canceled before details were released. A tank appeared in a screenshot, hinting that vehicles were to play a role, even if they were just NPCs.
Screenshots show that the game would take place in a modern day Middle-East location that looks like a war-zone, as destroyed Middle-Eastern-looking buildings appeared in the handful of screenshots released. There would also be a ruined office building somewhere in the game.
A magazine article that unveiled Serious Engine 3 showed off several weapons for the Unnamed Game.
- M67 Grenade
- FN SCAR-L with grenade launcher.
In addition, some unused animations for a model in Serious Sam 3: BFE (see below) suggest that a G36 and AT4 were usable at one point.
The Unnamed Military Shooter was scrapped because investors and publishers pulled the plug on it. Since Croteam were doing it on a “work-for-hire” basis, they resumed work on other projects after this game was canceled.  However, it served as an excellent example as to what Serious Engine 3 was capable of, several years before Serious Sam 3 came out.
The AK-47's magazine model and weapon texture appear in Serious Sam HD's files, but have no connections to anything in the actual game. They are most likely leftovers from the Unnamed Military Shooter.
A model named “gunner_01.mdl” in Serious Sam 3's files has animations named “idle_scar”, “idle_at4” and “idle_g36”. These appear to be leftovers from the Unnamed Military Shooter, as a screenshot of it featured a SCAR-H.
- The M29 Infantry Assault Rifle's animations have “AK47” in it's name. It's possible that the M29's animations were originally based off of the AK-47's, but were changed during production to be more fitting for the M29.