I think we thought they were a lot more sophisticated than they actually were. But shock and awe was designed to basically neutralize all of that anyway. The Navy was the night shift and that included a lot of tomahawk missiles too. The Air Force was the daytime campaign so there was a lot of capability to take out different threats.
The biggest threat I remember was we were very sure Saddam had chemical weapons (mostly because we sold them to him previously, but I digress). So we had to carry gas masks and did chemical attack drills alot. We also were forced to take many shots including small pox and an experimental anthrax shot. Many of my friends have medical conditions they believe are related to those shots.