The Mark 41 Vertical Launching System (Mk 41 VLS) is a shipborne missile canister launching system which provides a rapid-fire launch capability against hostile threats.
Refinement of the initial concept of Aegis system in the 1960s continued through the 1960s and 1970s, and the Mk 41 was conceived in 1976.
The Mk 41 is capable of firing the following missiles: RIM-66 Standard, RIM-67 Standard, RIM-161 Standard Missile 3, RIM-174 Standard ERAM, RGM-109 Tomahawk, RUM-139 VL-ASROC, RIM-7 Sea Sparrow, and RIM-162 ESSM.
Mk 57 VLS is the development of Mk 41 VLS. Developed by Raytheon, the primary improvement of Mk 57 GMVLS (guided missile vertical launching system) over Mk 41 is its exhaust gas management system that can accommodate new missile designs having up to 45 percent greater rocket motor mass flow rate than that of Mk 41. The unique symmetric geometry of the U-shaped gas management system facilitates the egress of gases, while minimizing flow into witness cells and reversed flow into the active cell. Elimination of a missile deluge system significantly reduces maintenance and personnel requirements, and protects against accidental missile wet-down.