How to upgrade Delta Operations Secret Service? In "Operation Delta", players will play as an elite special operations operator and go to the Ashara region to perform a secret mission. The story background of the game is set in 2035. Players will uncover a series of secrets of conspiracies in this land full of unknowns and crises. Next, we will reveal to you how to upgrade the Delta Operations Secret Service.
1. Frontal combat
Players who like to fight guns are first recommended to upgrade the [Training Center], which can improve physical strength and ground movement speed.
2. Collection direction
Players who like to collect resources recommend upgrading [Firing Range and Warehouse], which can increase the warehouse space and increase the load limit, making collection easier.
3. Trading direction
Players who like to buy and sell resources to make money can upgrade the [Technical Center], [Workbench], [Pharmaceutical Table], and [Armor Table] to create resources for sale.
The above is the entire content of the Secret Service upgrade method in "Operation Delta". For more game strategies, please click on the source code website.