知情人士称美国家安全局局长和副局长被解职！什么情况？

Group 1 - Timothy Haugh, the Director of the National Security Agency (NSA), and his deputy were dismissed on April 3, 2023, although the reasons for their removal remain unclear [1][2] - William Hartman, the Deputy Commander of the U.S. Cyber Command, has been appointed as the acting Director of the NSA, while Sheila Thomas, the Executive Director of the NSA, has been named as the acting Deputy Director [2] - The NSA is a critical intelligence agency under the Department of Defense, responsible for both offensive and defensive cyber operations [2] Group 2 - Reports indicate that Michael Waltz, the National Security Advisor, has been using the Signal app to create at least 20 group chats for discussing sensitive information related to various global issues, including Ukraine and the Middle East [2][4] - The phenomenon of using Signal for sensitive discussions is reportedly more widespread than previously reported, highlighting the Trump administration's reliance on this communication tool [4] - The Senate Armed Services Committee has called for an investigation into the use of Signal by government officials for discussing sensitive military operations [4]