Human Error
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Human Error is a 
Half-Life 2: Episode Two mod in which you play as a Civil Protection officer who must push back a Xenian invasion along with his squad.
Overview
The death of the Nihilanth threw the Xenian army into disarray, and the subsequent portal storms stranded many on Earth in the wake of the Combine occupation. After once more having to endure existence beneath the totalitarian boot of their cosmic nemesis, they have searched for a way out. Now, buried in the heart of a dilapidated university, they've found it.
Relish the opportunity to join Civil Protection and stop the Xenians from ever finding peace! Step into the jackboots of Anders, and follow his story through a moral quagmire of thinly disguised genocide and raging psychotics. Vortigaunts, Alien Grunts, and Controllers stand in your way from dashing the hopes of an entire civilization, but worry not: you have at your disposal all the perks of the Combine empire. Step into the APC, equip your manhack, and stand side-by-side with equally disgruntled traitors to the human race, Eloise, Noah, and Larson.