Much seems to be made of the fact that after the horrific earthquake in Chile last month, the military was sent on to the streets to help preserve order and the public approved.
I don't really understand the surprise. I have read any number of accounts as to how the military has accepted a role subordinate to civilian authority. As the linked article notes, Pinochet's grandson was booted from the military the day after he gave a defiant eulogy at Pinochet's funeral. The defense minister in the Lagos administration was tortured by Pinochet's regime. Her fine work as defense minister helped her get elected the first woman president in what is arguably the most socially conservative country in South America. She left office with approval ratings that would be the envy of virtually every democratic leader in the world.
The country is a different place these days.