"By the way Muslims are underrepresented in the US Armed Forces. Given a population of 291 million, with est 6 million Muslims, and a military of 1.5 million, Muslims are 0.85% of the Armed forces and 2.1% of the US population. 9/11 doesn't exactly have inspired a call to arms in defence of the United States, eh?"
Of course you didn't say they shouldn't serve, you simply implied that they are less then patriotic because they don't serve in numbers you believe they should.