Personally I wouldn't mix military academy and heroic epic. The reason is that at some point, most of my military unit production cities will already build units in 1, 2 sometimes 3 turns depending on the units. Putting both togheter might not even make a 2 turns unit being built in one, so the GG is basically wasted. I always settle GGs, usually all inside the same city to build super units, most of the time that city gets Ironworks and Westpoint. I also always make the Pentagon a priority. So, 5-6 GGs + WP + barracks + drydocks lets me run pacifism to get GGP bonus and bureaucracy to spam wonders. By the time I reach industrial or modern age, I can build new units with 17, 20 exp points, and 24 in the case of ships with drydocks. This makes some serious missile carriers. Heroic Epic is put in a city that needs about 5-6 turn per unit, usually a medium production city that can decently build units with HE and wouldn't be used for anything better than wealth otherwise.