President Trump's continued public backing of Defense Secretary Pete Hegseth, including recent affirmations of confidence amid the ongoing Iran conflict, forms the primary driver behind traders' 75.5% implied probability that he remains in office through December 31. Hegseth has overseen extensive leadership changes at the Pentagon since his 2025 confirmation, including multiple general officer removals and the August 2026 resignation of Army Secretary Dan Driscoll over policy and personnel disputes. While Republican Senator Thom Tillis and some Democrats have criticized management and called for replacement, no formal Senate actions or White House signals indicate an imminent departure. Scheduled confirmation processes, midterm timing, and the administration's focus on military readiness and force posture reviews further reduce near-term removal risks under standard cabinet tenure patterns.