Rick,
Your knowledge of typical JAG expertise is truly inspiring. The fellow I spoke with before I took military leave was a retired (active duty) O6 who was working as a Department of the Army civilian at the SJA office. He was extraordinarily familiar with USERRA, and gave me the ammunition to slam the company when they tried to push back. The company wanted me to sign a document with six stipulations on it before going on leave.
I brought it to him, and he said, "You are not obligated to sign this in any way; however, this document is innocuous. Let's add a seventh stipulation." He put the document in his typewriter, and added a comment siting USERRA and the applicable US Code, chapter and verse.
BTW, I also sought advice from ALPA, they were totally clueless, and told me that I had no protections, since my activation was voluntary (WRONG!).