[gabemart]

> Does anyone know what the codenames are like? If they are easy enough to remember, then they may be easy enough to brute-force?

I don't know what they're like, but if you take a list of 5000 common words and use 4 random entries for each codename, there are 625,000,000,000,000 possible combinations. Brute-forcing the entire space at 100,000 tries per second would take ~200 years.

Edit: I made a toy jsfiddle version: http://jsfiddle.net/SwWZ9/10/

The wordlist is just a random sampling of English nouns (I couldn't find a quick source of common nouns long enough). It may contain profanity, watch out!