1. Todd Combs joins JPMorgan to lead a new $10 billion investment group. 2. Combs brings experience from Berkshire Hathaway and respect from CEO Jamie Dimon. 3. His role focuses on investing in sectors key to national security. 4. Combs' unexpected exit from Berkshire shifts leadership influence in the finance sector. 5. Dimon's admiration for Buffett enhances the significance of this hiring.