Ægis, Greek mythology.
The goatskin breastplate or shield of Zeus(King of the gods) or Athena (goddess of wisdom). The shield, Ægis, when carried by Athena has the head of Medusa, retaining its powers of petrification, attached to the center.

The shield offered protection and security - to be under the ægis of someone, or something, is to be under its protection.

When you eat dirt for the first time and leave your family to build a shack in the woods

A prototype transformable commander use mobile suit from the series "mobile suit gundam seed". As it's model number gat-x303 indicates, it's built around the federation's gat frame. It's one of the four gundams that were stolen by zaft at heliopolis. It was given to and exclusively piloted by athrun zala until it self detonated in it's battle against the gat-x105 strike gundam.

The password to build/create faster in Age of Empires 2.

Some don't know that if you type this while playing the computer, they will build/create just as fast. *fizzzzzzzzzzz*

A class of cruiser used by the United States Navy. It is equipped with a powerful SPY radar system and considerable anit-aircraft capabilities.

stands for:

Alien Exterminating Global Intercept System

A secret branch of the global military that hunts down invaders and protects the smiles of tomorrow.
Many associated with the organization are referred to as GateKeepers.