Alyssa Cahoon, of Forest City, died following basic combat training at Fort Jackson in South Carolina last week.
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Doctors discovered she suffered from a rare heart abnormality.
She had been training there with her twin sister.
17-year-old Pa. National Guard soldier dies during training in S.C.
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Flags at all commonwealth facilities and all public buildings will be lowered to half staff until the date of Cahoon's burial.
Pvt. Alyssa Cahoon died Thursday with her family around her, the 1st Battalion, 34th Regimentsaid on its Facebook pageFriday.