can_be_warrior_trigger

can_be_warrior_trigger = {
	is_available_quick = {
		adult = yes
		imprisoned = no
		incapable = no
	}
	tgp_is_ceremonial_liege_trigger = no
	OR = {
		can_be_combatant_based_on_gender_trigger = { ARMY_OWNER = $ARMY_OWNER$ }
		AND = {
			$ARMY_OWNER$.culture = { has_cultural_parameter = high_prowess_ignores_knight_restrictions }
			prowess >= 10
		}
		# Japan Onna-musha
		trigger_if = {
			limit = {
				#not for admin
				$ARMY_OWNER$ = {
					NOT = {
						government_has_mechanic = administrative
					}
					culture = { has_cultural_parameter = non_admin_close_family_non_martial_gender_knights_in_defensive_wars }
				}
				culture = { has_cultural_parameter = non_admin_close_family_non_martial_gender_knights_in_defensive_wars }
			}
			AND = {
				$ARMY_OWNER$ = { is_at_war_as_defender = yes }
				OR = {
					is_spouse_of = $ARMY_OWNER$
					AND = {
						is_close_family_of = $ARMY_OWNER$
						is_married = no
					}
				}
			}
		}
	}
}

As written in game/common/scripted_triggers/00_war_and_peace_triggers.txt.