Mubarak ordered Tiananmen-style massacre of demonstrators, Army refused
americablog.com
americablog.com
Or at very least listen to the 15 minutes between 2:03 and 17:07. Yes it's a talk radio show and Yes talk radio hosts usually aren't the most informed. But this guy is (he helped rebuild Iraq, was in the first Gulf War, Bosnia, etc...)
If you don't have time the gist is that the Egyptian Army is a capitalist enterprise. They run factories, tour buses, own hotels and so on. Beyond that they have more exposure to America than most because their officers train here in the U.S. To understand the military's role in all that you have to understand those two facts and their implications
(Long story short: the Military was willing to put up with Mubarak but they weren't ever willing to kill Egyptians for him and were willing to toss him out on his a$$ once his craziness started to disrupt tourism and goods distribution)
https://secure.wikimedia.org/wikipedia/en/wiki/Gurkha_Contin...
The Egyptians have learned it seems. From what I understand the army did not just refused to fire but is also actively being disobedient.