The first question that must be asked, is "why" do you want to double major? In the civilian college world, kids double major for a couple of reasons. 1) they aren't quite sure what their main area of interest is, or they feel they are being pushed into an area and they have other interests, So, they choose 2 areas. 2) some think a double major will make them more competitive in the work force finding a job after graduation. 3) others think it improves their chances at getting into grad school.
The truth is, unlike a civilian in college, you are already guaranteed a job. And except for a small number of jobs, your major isn't as important to getting a job. I.e. You can be a pilot, even with a major in English. You don't need a degree in criminal justice for a job in security, or a degree in political science for a job in Intel.
As far as grad school, it is actually more narrow and concentrated than the bachelor degree. So, a double major doesn't really help the cause.
And truth be told, if you're a civilian college student on the typical 5-6 year plan, you can do the double major thing and not hurt your grades or do it because you don't really know what you want. But the academy is 4 years. Do you think you'll have a better shot at grad school with a 3.92-3.96 gpa in a single major, or with a 3.84-3.86 gpa with a double major because you had so many classes to do in 4 years? You know the answer to that.
I've had plenty of kids who came into the academy who think because they had college credit coming in, took all the IB and AP type classes, that all that would have been a waste I'd they don't use those credits, and thus want to double major. Truth is, those college classes, AP, IB, classes weren't a waste. THEY are actually what helped get you into the academy. Leave high school behind you. Once you get into a grad program, no one will care that you had a double major or what you B.S. Was or where.
Point being, to decide on doing a double major, must ask oneself first, WHY do you want a double major. The majority of reasons a civilian college student might want a double major simple does not apply or is conducive at the academy. It will actually hurt in more ways than help. Again, most jobs don't care what the major is, let alone a dual major. Second, one you have a masters or PhDs, your bachelor actually no longer matters. And one of the most important requirements for getting accepted to grad school, is your major and gpa. Easy when you have 6 years to complete your bachelor degree. Difficult to hold that high gpa when you must do it in 4 years, non-waiver.