The best place to get your Halo 3 Ranking not only for your state and country but the World is Halocharts.com There you will find all your Ranking for Every Weapon Every kill and so on!
halo PC does not have a ranking system.
General grade four
You have to work for bungie, the makers of halo 3. Bungie.net
You can't.
No
Halo 3 does work on Campaign as well as Xbox Live with up to 4 people
No it will only work on Xbox 360. Halo 1 and 2 will work on the original Xbox.
you have to gain 70 experience points, thus resulting in officer or lieutenant as it's called.
Your work for them.
you have to work for bungie to get recon
The HALO REACH multiplayer beta is coming in May. When it does come out put your Halo 3 ODST game disk in and in should be on the Disk menu.