有兴趣的可以对照官方的说明: :)
http://www.uscis.gov/graphics/services/visas.htm
A: Aliens
B: Bad guys
C: Cash cows
D: Dirt
E: Emperors
F: Yeah, all international students get at least one F
G: Good guys
H: Humble men
I: Intelligence
J: Juicy results
K: Kill those mail brides
L: Losers in a big company
M: McDonald customer
N: No way! They are special?
O: OK, you're useful
P: Physically strong, mentally? I don't know
Q: "Culture" means I want to see more stupid CUTIES like you in your country
R: Really! You believe in God? I don't
S: Suckers
T: Suckers + 1
U: UFO captives
V: VIPs