[edit: Used 40d vanilla, with following alterations]
Raw alterations:
Dwarves: No eat, no sleep, no drink, no alcohol dependence
Body: Nervous tag removed
Reactions: free steel and free fuel
Utilities used:
Tweak, to increase starting dwarves to 31.
Method:
I brought 31 dwarves and drafted 30 of them. The males (18, later 17) and females (12) were separated into 2 squads and stationed well away from each other while I had the remaining dwarf dig out two barrack spaces and create the necesary workshops and furniture. (At this point I undrafted my leader, who luckily enough was male.) This dwarf also churned out 29 helmets, since brain damage was still a possibility.
Mid-spring, first year
Once the armour stands and doors were in place, the sex-separated Recruits were locked in their barracks and allowed to spar until they were all Wrestlers. The two squads were then stationed in the same barracks and the door locked. They were taken off-duty and allowed to spar.
Mid-summer, first year
All wrestlers were now close to becoming Elites, so the barracks were undesignated and the 29 dwarves allowed to mingle. (Some of them already had lovers, but I didn't have a quick way of counting because the barracks were too small to station them apart.)
Spring, second year
This is the point at which I normally see the first marriages in a fortress. No marriages.
Mid-autumn, second year
Still no marriages. At this point, the door was unlocked and the two squads separated so that the female dwarves' relationships could be checked. All of them had lovers, though it was unknown how long ago the last pairing occured.
So it looks as though the only married military dwarves are ones that join up that way, or possibly ones that marry as Recruits. I haven't tested that, but since they're eligible for moods the game treats them as civilians in at least one way.