Military service within ukes specifically

Related to that child-looking questions lmao, anyways I've seen alot of manhwas here with twink ukes and though the characters say they've been in military service it doesn't look like it at all and always bothers me

Im AWARE some men have sleeper builds or doesn't gain too much muscles and I'm not in the military lol so idk what kinda training they go through or if it's like categorical like idk i heard there's like diff parts of military training. But anyways point is, why do they still somewhat look like a highschool dude. Not even slightly jacked. Also like they're weak too?! Like dude! Fight back you just did your service! Idk why it bothers me bec a dude still a twink after his service. Makes me doubt that huh... You sure you did your service...

Idk maybe im exaggerating a little of how these men should look after military training cus I will think anybody there is jacked lol