Eric Walker added The Future of the Submarine - Emerging Threats, Sensors & Transparent Oceans - YouTube to Columbia-class submarine

Eric Walker added "Boomers" to Nuclear-powered ballistic missile submarines

Eric Walker placed Nuclear-powered ballistic missile submarines under Nuclear triad

Eric Walker added The Future of the Submarine - Emerging Threats, Sensors & Transparent Oceans - YouTube to Nuclear triad

Eric Walker added Nuclear triad to Nuclear weapons