While you are out fighting the noble fight, we'd like to let you know that the newest map pack for Halo: Reach is now available for download on the Xbox Live Marketplace for 800 MS Points, or $9.99.
The Defiant Map Pack adds three new maps to the fray, one of which is a brand new firefight mission that comes packed with three new achievements for a whopping new 150 Gamerscore.
...enticing?