Operating directly under the National Command Authority, a relatively unknown entity of handpicked warfighters are called on when the mission must not fail. They are the Tier 1 Operators. They are real, living, breathing, precision instruments of war. They are experts in the application of violence. And they exist on an international level for various nations around the globe. In the U.S., their exact numbers, while classified, hover in the low hundreds.
Bellow you can see the release date and system requirements: