V-22 Osprey

The V22 Osprey is a US military V/STOL (Vertical/Short TakeOff and Landing) aircraft that was used by the Hazardous Environment Combat Unit during the Black Mesa Incident. It was used to transport personnel into combat zones.

Appereances
The Osprey makes it's first appereance near the end of We've Got Hostiles. It appears in both Half Life and Opposing Force.

Tactics
The Osprey is unarmed, and cannot harm the player, but sometimes they will keep on deploying soldiers until destroyed. In such cases, the RPG is your best bet, while the Tau Cannon makes a good back-up.