Will my already approved 5-16 school drop for further education be denied by HRC because my mos (infantry) is listed as shortage?

What- If it hasn't been approved by HRC- then IT IS NOT Approved!- If they have approved it, keep your fingers crossed, because they can change their mind.

Elaborate if you can...what major? Assoc? Bachelors? Grad level? Ambitions? Interests? Objectives? Try to do a detailed bio sketch, actual course titles, grades, GPA, if you can...I'll try to suggest more...the more you send, the more I or others might be able to suggest, OK? Eager to hear more, I'm Jere ifmyou want to chat, OK?

Usually not. Once your approved it is difficult to justify one guy in the overall picture.