The top internal investigative office at the Pentagon announced that it would probe allegations that Defense Secretary Pete Hegseth used the commercially available messaging app Signal to discuss classified information about a U.S. military strike in Yemen. The announcement comes about 10 days after The Atlantic revealed that its editor-in-chief was inadvertently added to a Signal group chat that included Hegseth, Vice President JD Vance, national security adviser Mike Waltz and other senior