Variable/Multistage Counter-Action Suite

The Variable/Multistage Counter-Action Suite (known also as the V-CAST or STALKER/Stalker) was a specialized collection of varying countermeasures used on late twenty-sixth- and early twenty-seventh-century United Nations Space Command warships.
Introduced in 2561 initially intended as an experimental system on AdWarFleet vessels. However, its surprisingly satisfactory efficiency led to the UNSC Navy's approval of Stalker as a standardized feature among all ships of the line and the majority of escort vessels.