Harvest ranger
From Tardis Wiki, the free Doctor Who reference
The Harvest Rangers were the people employed by Androzani Major in harvesting trees. They wore yellow armour and used Androzani Harvesters to travel. Their sensors could detect weaponry, though was confused by natural fibres.
In 5345, three Harvest Rangers (Droxil, Billis and Ven-Garr) were sent to harvest a living forest. They helped set up the satellites to spray acid on them, converting them to fuel. They encountered Madge Arwell, who had been transported to the planet while searching for her children. She was able to fool them and get into their Harvester, but the Harvest Rangers were teleported out before the acid rain started. (DW: The Doctor, the Widow and the Wardrobe)
