Nothing like drawing a generalization about the entire support force of the Army based on the performance of 1 unit.
If I was going to focus attention on any one aspect of that incident, it would be focused on the navigation error that lead them to be there in the first place. Simple attention to a very basic skill could have avoided the whole situation.
Another important fact that is conveniently omitted: Being ambushed at night in unfamiliar territory tends to negate a slight numerical advantage.
Don't get me wrong, I know that support units certainly aren't as competent in tactical skills as combat arms units(god how I know), but I think that article is a bit dramatic and draws many conclusions from a single episode.