Marine Ability to Reveal Cloaked Aliens?

Perfectblue

Does the marine commander possess the ability to reveal cloaked enemy alien units and structures? If so what is it called, and whats required to use it?

rantology

Yes, it's called Scan, it's an ability used from the Observatory structure. It costs 3 t-res, and when used it uncloaks all players/structures within the scan radius and also makes them show up on Marine HUDs/Minimaps. It can be canceled out using the Ink ability of the alien Shade, which also costs 3 t-res, but only if the Shade itself is inside the scan (the Ink can only emanate from the shade, whereas the scan can be placed anywhere).

The Observatory itself also unlcloaks aliens/structures in a radius around itself passively.

All you need to use it is an Observatory and the 3 t-res that it costs per scan.