Airwatch

Airwatch
Airwatch is a subdivision of Overwatch that deals with air surveillance and air superiority within- and outside of Combine controlled areas. Airwatch consists out of a numerous amount of air-mobile assets that are used for a dominant presence in the sky and above the city streets.

City Scanner
The most noticeable assets of Airwatch is the City Scanner, also known as Scanner type I. It's a light armored, flying security camera used by the Combine to monitor cities all across the globe. Its Synth counterpart is the Shield Scanner.

Shield Scanner
The Synthetic counterpart of the mechanical City Scanner, it is used commonly by the Combine forces to drop Hopper mines in combat areas. It uses a large pincher like appendage hidden in its shell to release the Hopper mines. When not handling mines, it is used for scouting and reconnaissance purposes. They sometimes accompany Striders.

Hunter-Chopper
The Hunter-Chopper is a rotorcraft used by the Combine to provide heavy fire support for ground units. Like the APC and the Razor train, this vehicle resembles re-designed and re-engineered human technology.

The Hunter-Chopper is basically a re-imagined human attack helicopter outfitted with Combine technology and redesigned for greater efficiency and lethality. It is crewed by a two man crew of Overwatch Soldiers, a pilot and a gunner.

The Design of the Hunter-Chopper seems to be based on an old Soviet military helicopter, the Ka-27.

Combine Gunship
The Combine Gunship, referred commonly as the Gunship, is an autonomous Combine Synth assault aircraft. Like other Synths, Gunships were living creatures that have been artificially altered and augmented with Combine technology. They are equipped with a Pulse cannon and a Belly cannon, the latter is only used to bombard fortified positions or urban environments.

The Gunship surpasses every of its aerial counterpart in maneuverability and accuracy with its pulse turret, and is one of the most feared aerial units in the combine arsenal.

Combine Dropship
The Combine Dropship, referred commonly as the Dropship, is a support and deployment Synth used by Combine forces for quick deployment by air in areas where they are needed.

Dropships are commonly used to transport important Combine assets like transport containers containing Combine Soldiers, APCs, Striders, Civil Protection units, and even HVT's on special occasions.

One important detail to keep in mind is that the transport container they carry has a Pulse cannon mounted on the top, this is used to protect the payload and the carrier.

Advisor Pod
The Advisor pods are large white synth ships about the size of a tank. They are only used to transport Advisors from location to location. It's a rare occasion to see one in the sky, they are usually accompanied by a large detail of other aerial units.