Half-Life: City 17

The prison where the Prison Guard work.

Crowbar is a classic crowbar.
Stunstick - shock baton.
9mm Pistol - a pistol similar to the USP.
Magnum.356 - Revolver.
MP7 - SMG with an underbarrel grenade launcher.
Crossbow - a crossbow that shoots red-hot reinforcement rods with enormous force and accuracy.
RPG - Rocket Launcher.
Shotgun - a shotgun like the Remington/SPAS12.
AR2 - Pulse Rifle. A powerful antimatter-charged assault rifle that can unleash hails of searing bullets. Alt can fire powerful balls with a massive energy burst that dissolve enemies at the molecular level, leaving not even gunpowder behind.
Frag Grenade - Fragment Grenade.
ARTC - anti-tank missile system.
The Pulse Shotgun is a shotgun that operates on the same principle as the standard AR2 shots.
Pulse Machine Gun is a heavy plasma machine gun.
Pulse Crowbar - Stunstick but in Crowbar form.
Hammer - sledgehammer.

City Scanner is simply a city scanner that takes photos of streets.
Shield Scanner is a secure scanner.
Claw Scanner - a scanner that can drop Rollmines.
Rollmine is an electromagnetic rolling mine.
Hunter Chopper is a helicopter with a machine gun.

Synths are biomechanical creatures created by the Combine Alliance.
Hunter - A tripod-legged synthetic, slightly shorter than a human, with two neon eyes, agile and fast. It has thermal imaging and night vision. It fires explosive Flecchettas (needles that pierce their victims and explode).
Combine Advisor - a levetirubic biomodified Shu'Ulatoi larva.
The Mortar Synth is a biomechanical artillery piece, smaller than a cow. It can fire 80,000 meters forward.
The Dropship is a large air cruiser, the size of two helicopters, that can carry a container/Strider in its claws. The shipping container typically contains soldiers. It has a durable chitinous shield.
Gunship - Similar to the Dropship, but more maneuverable, smaller, and armed with a discharge cannon and automatic weapon. It's called an airborne attack aircraft.
The Strider is the tallest land-based Synth, standing over 10 meters but under 16 meters tall. It's a three-legged, durable walker, though its legs are thin but strong. Its toes are sharp as spears. It carries two weapons: a plasma machine gun and, lower on its hull, a Warp Cannon capable of burning through buildings.

The Citadel is the main gathering place and business hub for Wooles Breen's Combine Alliance. It's a massive steel structure, a kilometer tall.
City 17 is a city under the control of the Combine Alliance.
Black Mesa is the secret base of the Resistance.

The Rocketeer is a soldier wearing heavy standard armor who has undergone extensive muscle modification and body reconstruction, with padding, ammo pouches, and other enhancements. He has orange eyepieces in a "gas" helmet and is armed with an RPG/ATRC (Anti-Tank Rocket Complex).
Sniper - a soldier with minor visual enhancements, wearing standard armor but with green lenses, ammo pouches, etc. His helmet has one reinforced eyepiece out of two for the scope. He is armed with a Crossbow, Crowbar, and a .356 Magnum.
Combine Heavy – a heavy soldier with extensive organ modification and body rebuilding, wearing anti-tank armor, shoulder pads, ammo pouches, and pads, among other items, with blue lenses in his gas helmet. Armed with a Pulse Shotgun, Pulse Machine Gun, Pulse Crowbar, and Hammer.
Note: All the soldiers here are wearing the same gas helmet as the Alliance Soldiers. They also have a gas mask and intercom.

Metrocop/Civil Protection: Humans who have undergone basic genetic modification and body restructuring, wearing relatively light armor. Armed with a 9mm pistol and a stunstick, they also wear the famous "gas" helmet with glass lenses.
Combine Prison Guards are Nova Prospect employees who have undergone advanced organ modification and body rebuilding, wearing standard Alliance armor with padding and medical/grenade pouches. They also wear a "gas" helmet, but their lenses are red. They are armed with a Stunstick, MP7 (SMG), and 9mm Pistol.
Combine Shotgun Prison Guard - a variant of the Prison Guard, but armed with a Shotgun instead of an MP7. Also features red lenses.
Combine Soldier - a soldier with advanced organ modification and body rebuilding, sporting yellow lenses. Armed with an MP7, 9mm Pistol, and Stunstick. Standard armor.
Combine Shotgun Soldier – Similar to the standard soldier, but armed with a Shotgun instead of an MP7. It has a darker red paint job and the same dark red lenses.
Combine Elite - Elite in snow-white armor with the maximum degree of processing and protection, with a bright red eyepiece and armed with a Pulse Rifle AR2, Frag Grenades, Crowbar.
Note: All soldiers wear a gas helmet, which is called a gas helmet only because it contains a gas mask and an intercom with a thermal imager. The helmet conceals the back of the face and head.

The man whom the Combine Alliance placed at the head of planet Earth.

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Combine/Alliance: A faction that enslaved people and land for control and resources.
Resistance: Rebels and others against the Combine faction.
Citizens: just people.

The Combine Alliance arrived on Earth and conquered all of humanity for resources and power. There is currently resistance.