Not sure if this applies to your situation,but when I posted to PRETC as a PAT,they offered a upgrade program right on base during the summer months.This wwas offered to anyone who wanted it and IIRC alot of people took advantage of that program.The teachers were all from the local high school,on contract to teach "summer school" and did the military schooling on the side.Usually you went to school 5 mornings a week,for 8 weeks.after that period,you wrote the GED and recieved your diploma.In the afternoon,you attended military training(compleate with PT),but were given time to study and do homework.
From what I've heard,Alot of the teachers enjoyed doing it as,the students they were teaching,were forced to be always on time,dutiful in thier studies,always had thier homework done and did'nt goof off in class!
Not sure if this is still offered at PRETC,and,if your trade choice is that which could end up in CFB Boredom.
If anything,this just shows you it is possible to do both.
PS-My inlaws used to live in Fox Creek!