Security strategy serves the continuous security of a state's well-being, its territorial integrity and sovereignty, the functioning of its political system, and the safety and security of its people and goods. Its goal is the applicability of military and diplomatic power in peace, crisis, and war. At the same time, force posture decisions, deployments, and the tactical use of force can have strategic implications. Naval strategy succeeds when the Navy complements and makes possible the execution of a coherent, overarching national security strategy. Sea control capabilities are at the heart of the naval mission set. It is noted that the roles of navies in strategic deterrence must be divided into general, conventional deterrence – "potential adversaries are deterred, or not deterred, by demonstrations of a navy's evident ability to perform conventional maritime 'war-fighting' tasks efficiently" – and nuclear (strategic) deterrence.