Stock Drop is the second mission in Tabacal and can only be unlocked by completing Freedom of Speech and then collecting major intel.
Overview
Upon discovery of a base that stores all of the collected coca leaves, Nomad and his team go to destroy the stocks.
Coca leaves taken from the local farmers are stockpiled at the Tabacal freight yard for delivery. I want you to get in there and destroy the stockpile. That ought to get Madre Coca's attention.
— Karen Bowman giving mission debriefing to Nomad
Mission Description
Coca leaves gathered by Madre Coca's enforcers are taken to an old freight yard where they are placed under guard prior to shipment out of the province. Locating and destroying those stockpiles would be a major setback to Madre Coca's operation.
When complete:
The destruction of the coca leaf stockpiles at the freight yard will make Madre Coca look weak to the cocaleros and the rebels. It will also disrupt the cartel's operations in the province.