I think one reason, among others, is that this nation is interested in propping up skirmishes here and there by floating pieces of misinformation to test their new missiles and defense equipment.  Predicated on the press reports, the latest attack in Syria by the USA provided an opportunity to test its new missiles coated with the stealth material which was proven to be very effective.  They want to make sure that in the event of a real war, they can rely on their defense armament.  I do not think this country is really interested in winning war, even though it is the ultimate aim of getting involved into any major war, because the continuation of war mongering attitude among different sect of people helps this nation more in the long run.  Needless to say, this nation has so much fire power, it can destroy the earth many a times, but that is not the aim.  They rather see division and ill will among nations which helps this nation economically and militarily.  Also, it helps this nation to maintain its hegemonic status in the world.  What the writer of this article basically is doing is proving the fact that in all wars, USA's participation was required, and that requirement helped this country maintained its super power status till to date.