Would it be possible for a military dictator to overthrow Obama?

This is an interesting subject.I recommend you watch the 1964 movie Seven Days In May which is about a military coup in the United States.There actually was an attempt in the 1930s to use the military to overthrow the US government.Marine Corps General Smedley Butler informed on the group and the coup collapsed.General Butler's testimony to the Congress about the details of the coup and who was involved is still secret to this day.The present day American military is about as capable of taking control of the government as Monaco is of conquering France.Since the US military is so incompetent that it cannot subdue Iraq or Afghanistan after more than seven years of effort,how can they install a military dictatorship in their own country?