The unit had secretly conducted covert operations from around the world, performing secret missions without involving the US military. Nearing the end of the series, COSMOS was sponsored by the Trident Corporation from the Pentagon when most of the unit took a massive number of casualties from the Spriggans after launching a raid on their facility (a US Army base in Japan) in order to rescue Rie and Akiha, held captive in order to draw Yu out of hiding.
COSMOS soldiers, now under the sponsorship of the Trident Corporation, was granted exclusive access to their prototype assault rifles as the unit was used as the corporation's special forces unit, as well as being outfitted with the Armored Machine Suit, which was made possibly under mass production. Currently, Trident Corporation is trying to use Sho Kanaya as a guinea pig to lead all active COSMOS soldiers with telepathic thoughts, reducing the need to field out experienced officers to take command during any combat missions.
COSMOS recruits, after being heavily brainwashed, are taken into secret training camps throughout the United States. From there, they are given special forces-level training such as commando skills, infiltration/exfiltration techniques, small arms handlings and martial arts.
|Raid on archaeological site||Somewhere in South America||Success, but all COSMOS soldiers and officers are killed|
|Assault on ARCAM's Japanese headquarters||Tokyo, Japan||Success, Akiha Ominae and Rie Yamabishi were captured|
|Raid on ARCAM archaeological site||Unknown||Success, all ARCAM personnel killed|
|Capture/Eliminate Iwao Akatsuki and Bo Brantz||Somewhere in the forests of Japan||Failure, Iwao Akatsuki and Bo Brantz escaped|
|Elimination of Iwao Akatsuki, Bo Brantz, Jean Jacquemonde and Yu Ominae||Ibid||Failure, all COSMOS platoons killed. Platoon leader forced to commit suicide|
In most of its missions, COSMOS soldiers are armed with Heckler and Koch MP5A5 and MP5SD6 submachine guns, Mossberg 500 "Cruiser" shotguns, Heckler & Koch PSG1 sniper rifles and Glock 17 pistols. Their standard equipment usually consist of olive green berets, M17A1 respirators and ALICE web gear.
After COSMOS was indoctrinated into Trident, they received mass-produced Armored Machine Suits and sport Trident symbols on their berets and BDU collars.