Does a strong military suppress democratization?

I think the following comparison between prospects in Egypt and Tunisia suggest that it does.

W]hatever dangers Tunisia now faces, there is virtually no possibility of a military coup followed by a state-sponsored war on the Muslim Brotherhood, as in Egypt. And this is so because of what may be the most salient difference between the two countries, at least in regard to their political trajectory: Egypt has an overwhelmingly politicized and intrusive army, and Tunisia does not. “None of the generals want a coup d’état,” says Adnen Hasneoui, an activist close to the ruling Ennahda party. “The only group which could carry out a coup would be the national police, and Ben Ali” — the former dictator Zine El Abidine Ben Ali — “designed the organization chart so that the police don’t have the power.” Indeed, Ben Ali’s inadvertent gift to Tunisia was to keep the military weak — Tunisia has only 27,000 very poorly equipped troops — and to exercise firm control over the Interior Ministry police.