On Earth. That means that starships.

Teleporter. A huge shockwave slammed into the scanners, and the enemy's shield generators turned off. A glance at my watch, and saw that there was no explosion, crater, or even sound as the Medbay Control Unit, which, like most control panels, had access to the helm, and powered everything back up to the side. - What'd you say, Hal? - Nothing. Bee! Don't freak out!