Clean shaven would be very Republican demographic. Think about the military or business environments where they enforce strict facial hair policies.
It's still not entirely clear to this day which candidate active duty military voted for, but there is some evidence suggesting they voted for Biden overall.
Do you have links? I imagine active duty military would be a Republican-leaning group overall because Republicans are generally more supportive of increased military spending. I imagine that Trump's opposition to mail-in ballots might have hurt Trump's performance dramatically with this group of voters, though.
On the flipside, though, the military draws a lot of NCOs from disproportionately poorer and non-white areas, which will generally (but obviously not universally) lean Democratic. Granted, the military is also disproportionately male. Fortunately, I don't really think the military as a whole leans strongly one way or the other, and I think that's one of the biggest natural defenses we have as a country against anyone trying to enforce a dictatorial rule.
