goon, if I don't get picked up for a commissioning program I'm applying for, I plan on going to Ranger School right away. The ONLY reason is to have some measure of credibility when I have to work with guys I don't know... which is often.
Having to prove yourself over and over again never ends for a support guy. Hell, it never ends for a tabbed guy to some extent. A lot of guys don't understand the concept of "I like my job and don't want to go SF" and the other opportunities available to say, 35M/35L/35P, that are not necessarily available to SF dudes.
So, if you go to Group as an MI guy having previously been a tabbed Regiment guy, it will definitely help you so long as you don't prove to be incompetent in whatever support you are providing. Having the trust of the guys you're working with is often the difference between actually being able to make a difference, or just being another body. I'm fortunate that everyone I work with have good reps with proven performance. That hasn't always been the case, in other units, and everyone suffers when that happens. That, and it's harder to get rid of someone in Group than it is in big army.