The Defense Inspector General's Office will look into whether the defense secretary improperly shared sensitive information on the commercial app.
Administration officials acknowledged that top leaders used a non-government group chat to coordinate ahead of military airstrikes in Yemen.
The alleged crimes took place between 2019 and 2023 in the Washington, D.C., area, officials said.
The U.S. antisubmarine task force captured the Nazi submarine along with its crew, technology, encryption codes and a working Enigma cipher machine.
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