In a survey of the preferences of serving members of the military, including the National Guard, strong preferences emerge in each race for the insurgent candidates.
However, they ran the question as a 'first choice for President' without requiring you to specify which in primary you were going to vote. Thus, we get a sense of overall support that is surprising.
In the Army and Marine Corps, Trump dominates the field. In both services, he has approximately twice the support of the next leading candidate.
In the Navy and Air Force, Sanders is the overall winner. Sanders edges Trump by a few points, though, rather than dominating the field as Trump does. Trump is an easy second place in both fields, although far more so in the Navy: Ted Cruz is close to Trump in the Air Force, but a bit behind.
Even in those latter services, where Sanders is the overall winner, Democratic first-choice votes are a minority. Sanders thus has extremely intense support, because he overcomes both the alleged frontrunner in his own party and a divided Republican field.
Clinton is the first choice of only about ten percent of military voters. The bigger services favor her more than the smaller ones: she is slightly above 12% in both the Army and the Navy, but well under 10% in both the Air Force and Marine Corps.