Follow up to Here Are the Attack Plans That Trump’s Advisers Shared on Signal – the Washington Post [no paywall] – “The inquiry follows revelations that top administration officials used the unclassified messaging platform to coordinate military strikes in Yemen…The Pentagon inspector general’s office said Thursday that it will scrutinize disclosures made by Defense Secretary Pete Hegseth using the unclassified messaging app Signal, as he and other top Trump administration officials coordinated a highly sensitive military operation last month in Yemen, complying with a request from Republicans and Democrats in Congress…“Whether intended or not, Secretary Hegseth endangered the lives of American servicemembers through his recklessness,” Reed, the Democratic senator, said in a statement Thursday after the inspector general’s announcement. “Had the intelligence in his chat messages been obtained by the Houthis or another adversary, it would have allowed them to reposition weapons to target our pilots with dangerously accurate intelligence.”

The purpose of this memorandum is to notify you that we are initiating the subject evaluation. We are conducting this evaluation in response to a March 26, 2025 letter I received from the Chairman and Ranking Member of the Senate Armed Services Committee, requesting that I conduct an inquiry into recent public reporting on the Secretary of Defense’s use of an unclassified commercially available messaging application to discuss information pertaining to military actions in Yemen in March 2025. The objective of this evaluation is to determine the extent to which the Secretary of Defense and other DoD personnel complied with DoD policies and procedures for the use of a commercial messaging application for official business. Additionally, we will review compliance with classification and records retention requirements. We may revise the objective as the evaluation proceeds. We plan to perform this evaluation in accordance with the Council of the Inspectors General on Integrity and Efficiency “Quality Standards for Inspection and Evaluation.” We will perform the evaluation in Washington, D.C. and at the U.S. Central Command Headquarters in Tampa, Florida. We may identify additional locations during the evaluation. The inquiry follows revelations that top administration officials used the unclassified messaging platform to coordinate military strikes in Yemen…”