A frogman is someone who is trained to dive or swim in a military capacity which can include combat. Such personnel are also known by the more formal names of combat diver or combatant diver or combat swimmer. Strictly speaking, "combat swimming" refers to surface swimming without a breathing apparatus for the purposes of coastal or ship infiltration. Such actions are a historical form of "frogman" activity and an important feature of naval special operations.

Headhunter or head hunter is someone who engages in the cultural practice of headhunting. It can also refer to:
In economics ,In the military, In video games, In music,In TV/film,

n antiquity, publicans (Latin publicanus (singular); publicani (plural)) were public contractors, in which role they often supplied the Roman legions and military, managed the collection of port duties, and oversaw public building projects. In addition, they served as tax collectors for the Republic (and later the Roman Empire), bidding on contracts (from the Senate in Rome) for the collection of various types of taxes. Importantly, this role as tax collectors was not emphasized until late into the history of the Republic (c. 1st century BC). The publicans were usually of the class of equites.