Orbital command

The orbital command is an upgrade to the terran command center. It was previously known as the surveillance station.

Overview
The number of command centers deployed in combat zones drove the development of standard schematics to upgrade them into a dedicated military role. One variant that entered service after the was the orbital command. The orbital command upgrade allows space assets to better assist ground forces.

Structures similar to orbital commands and planetary fortresses were in use by the Kel-Morian Combine by 2502.

Game Unit
The orbital command retains all of the command center's functionality except it may no longer load SCVs, or be changed into a command center or planetary fortress. The orbital command takes over the role of StarCraft's comsat station with the Scanner Sweep ability.

Wings of Liberty

 * See: Wings of Liberty command center

Strategy
Each MULE calldown provides increased mineral gathering rate at 270 minerals over 90 seconds, not limited to SCV saturation. Since all abilities have the same energy cost, Increased gathering rate is the opportunity cost of the other abilities. Compared to building a new supply depot, Calldown: Supplies instantly provides additional 8 food which is equivalent of 100 minerals, the cost of a supply depot, but sacrifices your mineral income rate.