From the website:

Nuclear Dawn is a multiplayer modification for Valve’s Source engine that combines visceral and violent First Person Shooter action with fast-paced Real Time Strategy in the aftermath of an apocalyptic war. You can choose the mission or lead the attack as a commander, marshalling resources and deploying weapons and equipment for your team to use. You can storm a building as an assault trooper, cling to the shadows and rely on your active camouflage as a stealth, or unleash terrible firepower from a powered suit of exo-armor. You have the responsibility and the power to decide the outcome of every engagement. If your opponents are lucky there will be enough of them left to bury.


On The Field

Three distinct classes to choose from with strengths and weaknesses that will help you overpower your opponents or keep you on guard.
A wide arsenal of weapons to deploy on the battlefield including mines, grenades, rifles, rocket launcher, and much more.
Original environments rich with detail and perfect for a nice and bloody battle. Take the streets of a desolate Japanese city, venture into the jungle to capture the live warhead inside a Korean nuclear silo, or fight for the treasures of one of several other post-apocalyptic locales.
As a Commander

Objective-based game play emphasizes coordinated tactics.
The environment and physics shape your strategy. Create chokepoints, defensive positions, and blast your way through the enemy positions.
Build a multitude of different structures to aid your team in its conquest. From a gateway that can bring in reinforcements directly to the battlefield to turrets that will pound your enemies into submission.
Choose your team's path with an intuitive but deep technology tree.
Secure resource points to deploy weapons and equipment to aid your team.

And a couple of screens for your viewing pleasure