आत्मसम्पन्नं सैनापत्ये यौवराज्ये वा स्थापयेत् ॥ कZ_०१.१७.४३ ॥
ātmasampannaṃ saināpatye yauvarājye vā sthāpayet
He should appoint one who is personally accomplished/fit (ātmasampanna) either as commander-in-chief or as crown prince.
Internal capacity—discipline, competence, and character—because these roles control coercive power (army) and future sovereignty.