DND stands for National Defense, AFP stands for Armed Forces. Primary task is to defend the people, the country/flag, the territory from foreign and domestic military aggression. I didn't include the Constitution. The Supreme Court protects it.
Secondary task is to assist other arms of the government in their PRIMARY functions with emphasis as being a support unit. DND has the resource/asset capability, manpower and expertise to lead, but at least other Departments should shoulder the budget and reimburse the DND from the incurred expense.
Personally, I really put my faith in the AFP to protect this country and her democracy from a dictator, from communists and religious extremism that resorts to terrorism.