The decision came after the service lost confidence in the commander's ability to lead, according to the Marine Corps.
Squads had grown to 15 Marines during infantry battalion experiments in recent years.
The Defense Inspector General's Office will look into whether the defense secretary improperly shared sensitive information on the commercial app.
An Army veteran-turned-stand-up comedian discusses the importance of laughter in the wake of trauma.
By Clay Beyersdorfer
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