How do you get more DP on Metal Gear Solid 4

There are alot of factors that can increase your dp if you dont alert any enemies that should result in some at the end of the act also you can watch the cutscenes and flashbacks the more you watch the more dp you earn.less kills equal more dp the better the weapon the more points.but the most can be achieved by destroying unmaned weapons.if you need any more help let me know