The helmet of Clone Captain Rex was decorated with Jaig Eyes.
The combat honor known as Jaig Eyes, or jai'galaara'la sur'haii'se (which translates to "shriek-hawk eyes" in Mando'a), were displayed on the helmet belonging to Clone Captain Rex. He obtained his Jaig Eyes from his instructors, special ops clone trooper commander Blackout, and Jedi Knight Kanan Jarrus, who, after losing his sight in his battle against Maul on Malachor, wore them on his eye mask.
