This remained the warhead of all Soviet MANPADS up to and including most 9K38 Igla variants; to address the problem of poor lethality, a more powerful HE filling than TNT, improved fuzing, a terminal maneuver, and finally a separate charge to set off any remaining rocket fuel were gradually introduced in later MANPADS systems, but the original Strela-2/2M warhead design of a 370 grams directed-energy HE charge in a pre-fragmented casing remained.