Career and 18x help

[Camo]

I plan to graduate high school this year, enlist in the National Guard in January, complete my training and then go to school full-time until I am age eligible for an 18x contract. I would like to transfer from the Guard to Active Duty through 18x. My question to you BTDT's is what is the best major to pick and what MOS should I pursue in the Guard, what would give more skills to be the best asset to the team? I appreciate any advice and wisdom any of you might have for me and thank you for letting me post here.