Never underestimate your adversary...

Army Spending $4B to Send Vehicles to Iraq:

"Defense officials say it wasn't a matter of poor planning but that insurgents have proven very smart. U.S. forces changed various tactics, including driving convoys fast through problem areas and getting jammers that foil insurgents' ability to detonate bombs by remote control, Smith said."

Sun Tsu would be disappointed in Rummy.

I. LAYING PLANS
...
17. Thus we may know that there are five essentials
for victory:
(1) He will win who knows when to fight and when
not to fight.
(2) He will win who knows how to handle both superior
and inferior forces.
(3) He will win whose army is animated by the same
spirit throughout all its ranks.
(4) He will win who, prepared himself, waits to take
the enemy unprepared.
(5) He will win who has military capacity and is
not interfered with by the sovereign.

18. Hence the saying: If you know the enemy
and know yourself, you need not fear the result of a
hundred battles. If you know yourself but not the enemy,
for every victory gained you will also suffer a defeat.
If you know neither the enemy nor yourself, you will
succumb in every battle.