This mod was a german fan-project called Tower Defense: Trinity Force for C&C Generals Zero Hour...
The EDS (Energy Defense Shield) protects your base
against missiles. The HQ is able to choose one of
three tactics. One of these tactics enable the
HQ-EDS. So nearby units and Structures get
protected and the EDS itself also deals some
energy damage to enemies. There's also a
mobile Version of the EDS: the EDS-Drones.