That's
Command Sgt. Major, and he knows better than anyone the supply lines fragility. The air traffic at Bagram and Kandahar is horrific, and he wants the supply lines, to the guys actually doing the fighting, not to be compromised supplying nonessentials to the guys that are at those bases as support.
There are no front lines, the people fighting are scattered at outposts where they are in constant combat with the enemy. They are stuck there until their unit is rotated out, or they are flown out on a litter. Either way, when they past through Bagram or Kandahar, pizza is the last thing on their minds.
The Command Sgt. Major is obviously more concerned for the safety and welfare of the fighting units than the off duty pleasure of the support personnel at the relatively safe supply bases.
I would suggest that you follow
Mike Yon's descriptions of how this war is playing out.