I completed my MBA during my last 20 months in the Air Force. I wasn't planning to separate when I started my MBA (it was needed to be promotable) but something happened about halfway through and I decided I had better things to do. I hoped the MBA would give me some credibility in the "real" world because my civilian experience was so thin (dinky summer jobs, work study jobs on campus).
Even more important, I knew little about business and I wanted a thorough understanding. My other degrees were technical degrees and I had never taken a business-related course.
I found the classes very interesting and I'm pretty sure the degree on my resume helped me get jobs. More importantly, the information I learned helped me understand what was going on around me in the companies I worked for, large and small.
I highly recommend you get your MBA, especially at that price. The price will actually be lower if you take into consideration the available tax credits.