I think you may be underestimating your experience. Most applicants don't have "formal" leadership experience in their jobs.
A lot of your success getting into a top MBA program comes down to how well you execute the applications - how well you are able to articulate why you want a business career in light of your experience to date (i.e. your reasons for wanting to get INTO business have to be much clearer than your reasons for wanting OUT of the law). If you can do that and choose a range of programs that you feel you'll be a great fit for given your career goals (you never mentioned what they are), you may just find yourself with an admit (or two) from a top school.
As for the military, having worked with quite a number of military officers in the past, I would seriously caution you about joining the military as a means to an end (the end being something like getting into b-school). And given the experiences they've shared to some degree about their tours in Iraq and Afghanistan, it's not something you just go into like any other job. In other words, you don't do it because you want leadership experience -- you do it because you believe in serving. That you're willing to put "serving others" ahead of your own self-interest.
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