Just read this about him;
'Although the show never mentions it by name, Dal Adal is probably the head of the CIA's Special Activities Divison. This unit is responsible to conduct black ops, in other words, operations that the government can deny knowledge of if things go wrong. Assassination would be such an assignment for this unit.'
So I'm confused too as I don't know if he's there to kill Haqqani or if he's on their side.