Turf is a Weapon style.
Weapons with the Turf style drop from the Home Turf missions Breaking Steel, Infiltrating Ace, Make Them Mad and Solitary Riot.
They are also dropped from Metal Part I content.
Turf Bow
Turf Hand Blasters
Turf Brawling
Turf Dual Pistols
Turf Dual Wield
Turf Martial Arts
Turf One-Handed
Turf Rifle
Turf Staff
Turf Shield
Turf Two-Handed