I'd be concerned, very concerned, if the military - at all levels - were not keen, enthusiastic, about performing that for which they were trained, paid and established !! .Indeed. The reality is that pre-TELIC and HERRICK most of us were desperate to go to war - and no doubt our Generals and Admirals were too, and exercised their influence accordingly.
Those who choose to blame it all on the nasty politicians are a bit lame really.
However, our involvement in the ME was purely a political decision.
Edit: In fact there was no military reason for our involvement. We now know that the threat, existence, of WMD only existed in dark corners of No10, and deeper recesses of Alistair Campbell's mind. The whole - continuing - debacle, was driven by Blair's ambition to bring regime change, and "improve the lives" of the populations of the respective countries . . . whether they wanted it or not .
Sometimes, the most difficult - and important - political decisions are those that require a negative response. A resounding NO!
The cnut Blair for his own nefarious motives of personal ambition and self aggrandisement, made the wrong decision .