A long time ago I remember playing a PC game around the time of HALO: COMBAT EVOLVED clones... one stood out in particular.
The story preface revolves around a war between Earth and aliens. Humans win by the skin of their teeth, but when the remains of the fleet comes back, they find that the war was a diversion and the aliens took Earth while they were away.
The commander during his speech calls his supersoldiers "his children" and the entire game is a mix between shooter, vehicular combat, squad tactics, and a light flight combat simulator to kill aliens by the hundreds.
It was interesting at the time because I remember the game letting me peek by leaning out of corners, having very tactical gameplay, and squad multiplayer with 8v8 and later I think 16v16 matches with Gamespy.
Notes: 1st/3rd person shooter, PC, game came out around 2002/2003