Gen David Petraeus earned an MPA and a PhD from Princeton while on active duty in the United States Army. I'm curious how that works. His assignment in the army is grad school? For how many years? Must've taken at least 4 years. Not passing judgement, just curious how it works. He also did a post doc fellowship at Georgetown. That's significant investment of tax dollars and time in this man's education. (Just an undergrad degree from one of the military academies has quite a price tag.) I'm sure he received his regular pay while he was a student, time that accrued toward retirement. --Not saying he didn't deserve it. I just didn't know this was an option while serving in the military. Does anybody know if it's a common practice?