Chaku, G5 Galaxy Police Force

Devin, Nate and Steele meet up with Chaku, especially after he's able to regain his ability to speak normally. Chaku states that he's in Earth on a GPF mission to hunt down and arrest Ryjack.

If you look at the scenes with Chaku talking, you can see that the metal armor has GAVAN written on it.

Example of:
Space Police