Serve with honor and keep sketching and learning.
As a 26 year old man, your high school record won’t be held against you, but your CC record will - so, once you’re done serving, settle in a state with a good CC to University system (Florida, Virginia, California are great in that respect). Spend 2 years in community college proving that your earlier CC record is a proof of your immaturity, not a proof of your intelligence, get high grades. You’ll transfer based on those grades.