But backups, as well as virus vaccines, are passive defenses.

Destroyers are larger, 4-8 section craft with some active and passive defenses, but tend to focus on firepower.

Those unfinished hulls were sitting ducks, with neither active nor passive defenses.

Barrage balloons were limited in application, and had minimal success at bringing down aircraft, being largely immobile and passive defenses.

In the first game, given here, he briefly flirted with counterattack, then jerked back to extremely passive defense and went down without a fight in only 23 moves.

The local orbital fortifications are laughable, and Grayson doesn't know how to generate spherical sidewalls, so their forts don't have any passive anti-missile defenses.

Frequently, Teg railed against passive defenses.

Even capital ship missiles were seldom capable of doing truly critical damage against their massive armor and powerful active and passive defenses.

Black, however, does not have to acquiesce to passive defense and has at least as many attacking threats.

Penaids- Electronic systems carried by missiles to assist them in penetrating their targets' active and passive defenses.