This is the first (subtly) anti-Obama summer blockbuster. The "President" (as he is always only referred to in your good solid world-threatening film in which he does not play a character) is issuing ineffectual and meddling orders from afar, through his National Security Advisor. They are constantly standing in the way of the leaders of joint military alliance between US military and the Autobots (who though they can't prove why their opinions are right (they just *know* they are) the audience knows they're right). Unlike your usual action film though, made in a historical vacuum where the mention of a President's name can't date the film, there is actually one little mention of "President Obama" (he's being taken to an undisclosed location after a big Decepticon attack). So a text on civilian power meddling in military affairs they can't understand also becomes a little political jab.
Additionally, the military's capabilities seem to have drastically improved since TF1. Towards the end of the film there is (spoiler alert) a big battle (aren't you glad I warned you?). A deafening roar of hot metal-on-metal action with some bullets, grenades and tank rounds thrown in for good acoustic measure.

The difference here from the first film is that in TF1, the only way to kill a Decepticon was with an Autobot. It's pretty standard movie fare - if you're fighting an alien race, you can only BARELY defeat them with human ingenuity, UNLESS you are allied with the good half of that race, then only they can kill the evil half. In this epic (loud) battle sequence, the human unit commander calls in a special send-everything-we've-got strike force. And after a 1.5 minute montage of clips from Navy and Air Force recruiting commercials, the men and women of the US Armed Forces starting fighting the Decepticons. And doing so quite effectively. Tank shells seem to work the best, but also machine gun rounds seem to do some sort of trick.
The important difference in this film is that we are in a military alliance with the Autobots, and we are keeping up our end of the deal. They're not just protecting us. And of course it's no surprise that Michael Bay gets the unparalleled access to military kit that he does with a film like this. (My friend who worked on it says, and who knows if it's true, that the military sees recruiting spikes after every one of his movies.) No surprise also that one of the early posters for the film included the tagline "Roll Out".






