Yeh you get both upon completion of all achievements, which weren't hard at all except Steppin' Razor and Two for One Laser
http://www.bungie.net/Stats/Halo3/De...oO+DIABLO+X+Oo

Wish I worked for bungie so i can get this:
http://www.bungie.net/stats/halo3/sc...?ssid=15312761
If you didn't notice, the shoulder guards are the (CQC?) except the little latch is flipped open. Kinda lame but still its unique to bungie employees