go to http://callofduty.wikia.com/wiki/Callsigns
if u have ps3 add ownupwnu69 for mw2
http://callofduty.wikia.com/wiki/Callsigns
50 multi-kills with claymores, frags, rpg, and/or c4
By getting into a tenth prestige lobby.
Yes you lose everything but titles and emblems
1000 kills with it ,tactical knife doesn't count.
Theres no need to prestige unless you want the extra tittles and emblems on mw2.
The angel of death title, can be unlocked by calling in a large amount of AC-130's (i'm not sure how many you need). Their website has a list of all available titles and emblems, and how to get them:
no. for prestiging you only unlock new titles/emblems extra custom classes and a new symbol.
UAV is the first moving killstreak; on the page with the moving emblems, AC130 comes first.
From prestiging in modern warfare 2 u get an extra custom class and new emblems and titles.
Sorry I'm not sure what you mean but spectre refers to the ac-130. You can get different spectre titles and emblems if you want...