Total the number in the military, the police, and the reserves. Then double it to account for their maximum possible growth. In a country that has security forces of 5.5 million, that would mean a max of about 11 million.

The rule in counterinsurgent war is that the security forces need a ten to one manpower ratio, in order to maintain control. While the insurgents need to exceed a one to ten ratio, to tip the scales in their favor.

Therefore; in a hypothetical country of 300 million, with security forces that could theoretically grow to 11 million, an insurgent force would need to exceed 1.1 million, in order to over-extend the resources of the enemy. T.E. Lawrence once calculated that it took no more than 2% of a country's population to wage effective insurgent warfare. So, in a country of 300 million, one is looking at insurgent forces of perhaps as many as 6 million to bring about total victory.