Superior Defender

Superior Defender is a perk added to Fallout 3 in the Point Lookout add-on. When the player character is standing or crouching in place, it adds +5 points of damage to weapons and +10 points to armor Damage Resistence. The benefits are reported in the Pip-Boy under the "Effects" screen. But due to a glitch, the +5 points of damage apply even when not standing still.

The +5 damage is added to each bullet, making it far more powerful when used with automatic weapons.

Obtaining
The Superior Defender perk is earned upon completion of The Local Flavor quest.(Given by Desmond Lockheart as a training as he call it himself)

Behind the scenes
The icon resembles a Greek Hoplite.