Within the upper chambers of American defense governance, a quiet but consequential transition is underway: the White House has begun searching for a successor to Deputy Secretary of Defense Eric Feinberg, who is departing the Pentagon under Defense Secretary Pete Hegseth. The deputy secretary role — steward of an $800 billion enterprise and the operational heartbeat of the entire Department of Defense — is rarely vacated without ripple effects across military readiness, procurement, and policy. That the administration is moving swiftly to identify a replacement speaks to both the weight of th