|The following is based on Fallout Tactics and is not canon.|
You've learned the value of sucking up to your superiors! You get one extra promotion for each level of this perk.
Behind the scenes
The term "Brown Noser" is applied to those who tend to superficially attempt to impress their superiors for personal gain. A similar name would be "Kiss-ass". It implies that one sticks their nose in deeply while kissing a superior's buttocks, thereby having the nose come back out brown.