That is so AWESOME!!!
I had a mom (one of many) that went that route, and it was such an empowering experience, I know exactly what your son is feeling.
Best part is, he will have the tattoo with the MOST cachet of all his friends, and it is temporary and can be invisible should he chose it to be.
You are raising a mighty fine child army there Maam. I expect some top notch culture jamming from them in the future. *tips hat*
Bruce