You're coming out as bi, correct?
One obvious item you'll have to deal with is reassuring those who know you well that your newly-revealed interest in men is not merely a consequence of your disappointments with your past female relationships (fiancees caught cheating, etc.)
As a collegiate psychology major, you'll have easy access to APA guidance on LGBT concerns that will help debunk common misconceptions about "Why you are gay/bi" from your colleagues, friends, and family, especially from a professional perspective.http://www.apa.org/pi/lgbt/index.aspx
Also as active duty in the post-DADT age, you now have a military service that should be freshly boned up on counseling and guidance for LGBT service members.http://www.sldn.org/pages/guide-to-open-service
No matter where your family and friends are on the spectrum of reactions to your coming out, universally these folks are interested in you maintaining your health. And eventually, all will agree the ability to be honest and forthcoming about who you are interested in romantically is healthy, for you and everyone who knows you.
I agree with the suggestion to start with friends, then siblings (if any), and learning from the responses, reactions, and advice to build up your confidence for your tougher assignments.