A hunter-killer team is a team that separates the tasks of "hunting" and "killing" to two or more individuals.
Examples include:
Two-person sniper teams, one using specialized optical hardware and the other a rifle
Pairs of F-4GWild Weasel V and F-16Cs, where the F-4G "hunter" could detect, identify, and locate an enemy's radar and then direct the F-16C's weapons to the site
Task Forces such as Task Force 88 where one element, the "hunter," (e.g., CIA Operatives) gathers intelligence on the target while the other, the "killer," (e.g., Delta Force or Rangers) acts on the intelligence and eliminates the target.