They're Random, Baby!

Installment One Keyes' Corner

Assault on the Control Room
Active Camo 2

Here is the location of the second powerup; it's in the tall tower building (ground floor) just after you exit the tunnels. The third powerup, not visible in this map, can be found at the point at which you must abandon the Scorpion.

Watch the AotCR Invisibility Movie

(There is just one movie for this level - it shows 2 of the three powerups, and a bit of what you can do with the glitch.)