The decision came after the service lost confidence in the commander's ability to lead, according to the Marine Corps.
The Defense Inspector General's Office will look into whether the defense secretary improperly shared sensitive information on the commercial app.
Both Norman Scott and Daniel J. Callaghan would be posthumously awarded the Medal of Honor for actions during the intense naval battle.
By Jon Guttman
Republican and Democratic leaders on the Senate Armed Services Committee are requesting a formal investigation into the Signal chat scandal.
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