From The TimeSplitters Wiki

Male Trooper
Image Needed
Unlocked by	Beat TS2 Amature League> It's a Blast> Demolition Derby with Silver or higher
Species	Human
Size	Normal
Accuracy	7
Agility	6
Stamina	6
Fire Proof	N/A
Shock Proof	N/A
Default AI	4 Stars
Native TimeZone	2401
First Appearance	TS2 Arcade Mode
Relations	N/A
Games	TS2

TS1 Gesture	N/A	TSFP Gesture	N/A
TS2 Gallery	The Marine Troopers have borne the brunt of the TimeSplitters onslaught against humanity.	TSFP Gallery	N/A

The Troopers of the Timesplitter war appear to be an elite unit in the Human Forces. Though never featured in the Story Mode of TS2, their presence in the war is implied. It is also possible that Sergeant Cortez and Corporal Hart could have been members of the Space Troopers