is it capable to become movie director with military background?

[Johnny Akiba]

when i watched Shark Tank with John Paul DeJoria appeared as a guest, i look at him and my gut tells me "i think he had spent the time in military before", and confirmed it when i checked the wiki. that got me thinking: if he can become an entrepreneur, why can't someone become a movie director?

and so this question clicked me: is it capable that someone with military background can learn to become a movie or tv director in the future? or do we already have one?