The Defense Inspector General's Office will look into whether the defense secretary improperly shared sensitive information on the commercial app.
Lance Cpl. Jonathan Phillips spent 20 months in prison, half of that in solitary confinement.
The Army is close to signing off on a low-rate production contract for a new missile defense radar to replace the old Patriot system's sensor.
For some U.S. allies, the leaked group chat about a planned Yemen attack casts doubt on intelligence-sharing with Washington.
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