Pre-war strategy made evident and calculated use of speech acts — ie: performing the existential risk to a 'complex' of referent objects — so it shouldn't be too surprising that the war itself was in part a sort of speech act; making the driving ideology materialise in practice.
Iraq War was held within the broader ideology of War on Terror — which is ongoing — so research into the various driving forces is important work, so that we can better understanding foreign policy & shifting power dynamics (which classical IR has fuck all to say about).