1st Special Forces Operational Detachment-Delta (1st SFOD-D) is one of the United States' best and elite secretive tiers of counter-terrorism and Special Mission military units.
Delta Force makes its first game appearance in the series in Spec Ops: The Line.
- The M4A1 and M249 SAW were both retired by SFOD-D after the Heckler & Koch HK416 and Mk 40 were created but Walker and Adams still used those retired weapons on their field mission in Dubai. However, with the freedom many special-operations units are given towards their weaponry, it is possible that the members of Delta decided to use these older guns for some unknown reason. It also may be a licensing thing with the manufacturers of the older guns.