I was doing some googling today and ran across this Air Force site with lots of pics and videos from the Humanitarian Relief Mission from Operation Enduring Freedom. The pics are mostly from October - December, 2001, and show how the Humanitarian Daily Rations (HDRs) were loaded onto C-17s and airdropped into Afghanistan.
I've included a few sample pics below (click on them for larger versions), but I'd also encourage you to visit the site above for more.