TAG/unit release to SF

[PTHFNDR]

I USED the search button and couldn't find anything on this, so I was hoping to get an answer from one of you.
I am in a situation, unit is deploying soon, and don't think my unit will release me to go to the 19th SFG. I understand why and all, but is there anyway to get released aside from an IST? I am not trying to piss people off and have a good relationship with my unit currently. I am just looking to do bigger and better things in my carreer at this point in time. I am not trying to get out of a deployment, which probably comes to many minds, as I have a deployment under my belt already. SF has always been a dream of mine and I have just now pulled my head from my 4th point of contact to make it possible. Any advice or insight would be greatly appreciated. Thank you.
Let the heat rounds fly!