I usually try and spread Military Instructors around to 2 cities early on to have Level 2 units. I decided this game I would focus them all on 1 city. This city built units most all game. I put Heroic, West Point, and a Mil Academy here. After building Pentagon, I was producing 25 XP units. I also used 2 other GG on 2 medics. Whats your best military city?