Group 1 - The "Iron Dome" missile defense system proposed by the Trump administration will consist of a four-layer defense system, including one space-based layer and three ground-based layers, with plans to deploy 11 launch systems across the continental U.S., Alaska, and Hawaii [1] - The space-based layer will have missile warning tracking and interception capabilities, while the ground-based layer will include interceptors, radar arrays, and potentially laser weapons [1] - A new large missile base is planned in the Midwest for deploying Lockheed Martin's "next-generation interceptor," which is designed for the Ground-based Midcourse Defense (GMD) system, the core of the current U.S. ballistic missile defense system [1] Group 2 - The project is inspired by Israel's "Iron Dome" system but will require a significantly larger number of launch systems, interceptors, and ground stations due to the expanded area to be protected [2] - The Trump administration estimates the project will cost $175 billion, but the Congressional Budget Office warns that total costs could rise to $542 billion [2] - Congress has allocated $25 billion in special funding for the "Iron Dome" project as part of Trump's tax and spending legislation [2]