CIWS

CIWS (close-in weapon system) is a defensive weapon system utilized by naval vessels to protect them from enemy missiles or aircraft. They are capable of inflicting heavy damage to aircraft that fly too close, and can neutralize all enemy projectiles (missiles, bombs,e tc.) threatening any friendly ships. However, CIWS are notably ineffective at targeting numerous projectiles at once.

Appearances
CIWS appeared briefly in Ace Combat 5: The Unsung War. During Narrow Margin, at least one ship can be heard utilizing. Additionally, prior to the OFS Kestrel's sinking, the aircraft carrier attempted to use CIWS to destroy the submarine-launched missiles. However, the system could not destroy all of them, and two missile impacts caused the ship's destruction.

Trivia

 * In the real world, "CIWS" is typically pronounced "sea-whiz" instead of spelling out the acronym.
 * CIWS are typically gun-based, but can utilize missiles and lasers as well. While not naval, a potential demonstration of laser-based CIWS can be seen in the MQ-90Ls and in the SOLG program satellites' defensive systems.