Is there a way I can do ACCA while in the military?

I work in a practice atm, but am thinking of joining the British Marines. I know I wouldn’t be able to do any work hours, but can you complete the exams and just have the qualification pending valid work hours?

I’d need to stay in service for 4 years. Could I take the exams over those 4 years, then do the work hours when I get out?

Not sure how it works. Thanks.