Frogman

 is a warrior of the Marines.

Background
It costs 1500 Resources to train this specialist. Once research has been done at the Barracks, any Grenadier can be trained there to become a Frogman. With a little hard training and the Grenadiers' existing knowledge of explosives, the Marines have developed an elite corps of shoreline demolitions specialists, called Frogmen. Though they're not armed for heavy ground assaults, these units are excellent covert operatives and can move over land or underwater. Ideally, Frogmen are loaded up with explosives and sent down river to blow up any enemy base unfortunate enough to be along the coast.