How can one get a Ph.D in Military Science after a MA degree from AMU( American Military University)? Is there an online Military School that offers that or is Union Institute okay?
Assuming you can form a committee, it is likely you would be able to design a degree around that subject while studying at UI&U. However, you should ask them whether or not your master's will be acceptable to them for admission. There are changes afoot at UI&U which may or may not have bearing on your ability to pursue a degree with the specialization you wish. Again, you should ask them.