Standard warheads in planetary combat, the High Explosive warhead is always used in a shaped charge fashion to direct all of its energy into a target. HE Warheads are perfect for anti-powered armor, anti-missile, and anti-strike craft functions due to there ease of manufacture and lack of lasting fallout/radiation.
See Damage Rating (Version 3) for an explanation of the damage system.
Effective Damage Rating (Micro Missiles):
Effective Damage Rating (Cruise Missiles): 3 ADR