RIM-116 Rolling Airframe Missile

The missile must roll during flight because the RF tracking system uses a two-antenna interferometer that can measure phase interference of the electromagnetic wave in one plane only.

The original weapon cannot employ its own sensors prior to firing, so it must be integrated with a ship's combat system, which directs the launcher at targets.

SeaRAM, a launcher variant equipped with independent sensors derived from the Vulcan Phalanx CIWS, is being installed on Littoral Combat Ships and certain Arleigh Burke-class destroyers.

SeaRAM was developed in response to concerns about the performance of gun-based systems against modern supersonic sea-skimming anti-ship missiles.

South Korea has signed license-production contracts for their navy's KDX-II, KDX-III, and Dokdo-class amphibious assault ships.

The Block 2 (RIM-116C) is an upgraded version of the RAM missile aimed at more effectively countering more maneuverable anti-ship missiles through a four-axis independent control actuator system, increased rocket motor capability to 6.25–inch diameter, an improved passive radio frequency seeker and upgraded components of the infrared seeker, and advanced kinematics.

[14] In early 2018 the U.S. State Department approved the sale of RIM-116 Block II to the Mexican Navy for use on their future Sigma-class design frigates, the first of which was jointly built by Damen Schelde Naval Shipbuilding and launched in November 2018.

[15][16] In 1998, a memorandum of understanding was signed by the defense departments of Germany and the United States to improve the system so that it could also engage so-called "HAS", Helicopter, Aircraft, and Surface targets.

The SeaRAM combines the radar and electro-optical system[3] of the Phalanx CIWS Mk-15 Block 1B (CRDC) with an 11-cell RAM launcher to produce an autonomous system—one which does not need any external information to engage threats.

[18] In late 2014, the Navy revealed it had chosen to install the SeaRAM on its Small Surface Combatant LCS follow-on ships.

[25] The Canadian Government on 28 June 2024 when announcing the River-class destroyers published a fact sheet that showed the Rolling Airframe Missile.

Sailors handle the rolling airframe missile system aboard the Nimitz -class aircraft carrier USS Harry S. Truman .
The aircraft carrier USS Theodore Roosevelt launches a Rolling Airframe Missile (RAM).
SeaRAM
Map with RIM-116 operators in blue