Raven

The Raven, formerly known as the Nighthawk, Vulkan and the TF-620 Nomad,  is a terran air unit featured in StarCraft II. It is based on constructing objects.

Overview
Operationally linked to an AI, the Raven is an all-around workhorse that combines the functions of a surveillance drone and a combat engineer. A common sight among the Fringe Worlds, these robust air-mobile vehicles are built to operate independently in harsh climates. Ravens excel in protection and reconnaissance due to their defensive auto-turrets and their advanced sensors, which can detect cloaked or burrowed enemies. The Terran Dominion initially designed the Raven to give low-level protection to its most isolated outposts, but recently the Raven has been used in escalating levels of conflict to replace the older and costlier science vessel.

Game Unit
The Raven is analogous to the science vessel of the original StarCraft, and are "primarily support craft" for the terran factions. They have no standard attack of their own. They are strong against s.

Wings of Liberty
In StarCraft II: Wings of Liberty, Ravens are unlocked through research. This costs 20 protoss research points, and is an alternative to the science vessel.

Trivia
If one looks at the unit portrait in the map editor, one can find that on the back side of some of the monitors there are unit ability icons such as cloaking, lockdown, lift off, load, Hercules dropship's rapid deployment and an unknown icon. There is even the "unload" command icon behind the machine in front of the user.

There is an animation where all the monitors explode and the pilot facepalms.

Its structure resembles that of the Arbiter.

The pilot has his face angled away from the camera as shown in the photo below, but if seen from the front in the game files he has a generic face with wrinkles and a microphone. He sits with his mouth open. In some regards he can be viewed as a "gamer" because of some of his actions.

Quotations

 * See: StarCraft II Raven Quotations