If you lose your 50 in Halo 3 will you lose your general?
No you can't, your rank(i mean like General or Luitenant not like your number rank) can never go down.
In Halo 3 matchmaking, there are social and ranked playlists. Each ranked playlist has a separate skill number from 1 to 50. The true-skill system is very complicated but in general you play with those of a similar skill and the skill will rise if you win games in that playlist however it will go down if you lose. The highest skill is simply the skill that is highest of these playlist.
The Announcer (voice by Jeff Steitzer) is the male voice in Halo: Combat Evolved, Halo 2, Halo 3, Halo 3: ODST, and Halo: Reach multiplayer that calls out certain phrases when the criteria are met (like the Announcer calling out medal titles when certain medals are obtained and general events in the game). Sources: Halo wikipeida
Yes, there is a Security armor in Halo 3, Only the head and shoulders are unlockable.To get the head, you need the gamerscore in Halo 3 to be 1000g/1000g. And for the shoulders, the gamerscore is variable from 700-800 for some reason. (Note: If you get the shoulders, there is a glitch that makes you lose them when you earn them, but don't worry, they return back.)I hope this is useful!