This unit is known as a Paratrooper in vanilla Civ3. The Conquests expansion renamed this unit to Modern Paratrooper, infantrymen specially trained to execute airdrops. When a paratrooper is active in a city with an Airport it may perform an airdrop. Press [A] then click a target square within range to launch the airdrop. Otherwise, paratroops act as normal infantry. A city must have oil and rubber in its Strategic Resource box to build a paratrooper.