I sincerely hope that you have carried out your promise and ended it all. I am currently surrounded by millions of our American cousins with ranks ranging from MSgt to 3 Star. Most of them think that irony is something to make your clothes flat and they wouldn't notice sarcasm if it dropped through the roof strapped to a JDAM ridden by the ghost of Marilyn Monroe singing 'we're off to see the wizard'.
In answer to the original question - sarcasm absolutely has a place in every walk of life and most definitely in the military. It should, however, only be used in the hands of a skilled proponent; there are few things worse than a 'tard who thinks he's funny but actually isn't.
PS I may have exagerated the numbers of Americans ever so slightly.