| abstract
| - Derived from the launch systems developed for ballistic missiles aboard SSBNs, a VLS forms a scaled-down equivalent for launching cruise missiles such as the Tomahawk and surface-to-air missiles (SAMs) such as the Standard missile. When installed on a SSN (nuclear-powered attack submarine), a VLS allows a greater number and variety of weapons to be deployed in comparison to using only torpedo tubes. A VLS allows surface combatants to have a greater number of weapons ready for firing at any given time compared to older launching systems such as the Mk-13 single-arm and Mk-26 twin-arm launchers, which were fed from behind by a magazine below the main deck. In addition to greater firepower, VLS is much more damage tolerant and reliable than the previous systems, and has a lower radar cross-section (RCS). The U.S. Navy now relies exclusively on VLS for its guided missile destroyers and cruisers, an advanced Mk 57 VLS system is projected to be used on the new Zumwalt class destroyer, and the older Mk-13 and Mk-26 systems remain in service on ships that were sold to other countries such as Taiwan, Greece, and Poland.
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