ready for battle?

Is it odd? On our way to office today we saw three US army tanks set up on the three sides at the end of the airport runway – all of them with 3-5 men in full battle gears. We also met two military jeeps with soldiers who looked rather tense in my opinion. As far as I can remember when US Pres. Bush came for visit, they only set up one tank near the runway. Is it some sort of exercise or is something brewing up? Everybody and everything else looks normal but this picture is eerily out of place. I feel more disoriented knowing it’s entirely my own fault that I am somehow oblivious to important things…