Going to law school and want to switch from National Guard (11A) to Active Component as a JAG afterwards

I am a current an infantry 1LT(P) in the Arkansas National Guard and about to start law school this August. My 6-year obligation to the Guard ends in the middle of my time at law school, and I would so much rather be able to jump onto an active duty branch as a JAG (currently in the Army Guard but don't care if I need to switch to another service branch IOT do it full time). Is there anyone out there who can assist me in figuring out how to do this? I originally thought I could just quietly leave the Guard and then join AD with no problem and all the time in service, rank, etc intact. A friend of mine said that he thinks I would need to resign my commission IOT leave the Guard and then is unsure if a commission can be retaken or a new one given upon joining AD.

If anyone here is/was or knows a branch manager or anyone else who can help me, I would appreciate it. I am also going to talk to my BC about it, but any extra guidance is appreciated.

Thanks to anyone who can help.