We had one in our command train at Ft. Bliss and another at Ft. Bragg. Looks like there are many installations that provide IA training according to the Navy IA website.
We have a Navy Det here at Lewis who works with us when we have Navy units coming through (mostly Gitmo and Medical teams for Centcom)...we give them hell for that snazzy blue camo uni they wear ;)
You’re right though, others do go through Bliss and Benning I think.
regards,