The incident occurred during routine training aboard the base, the service announced.
Shay was awarded the Silver Star for repeatedly plunging into the sea and carrying critically wounded soldiers to relative safety.
Wearing a 48-pound prototype suit, the former West Point soccer player crossed the finish line with the watch reading 10:19.
By Bridget Craig
An Iraq War veteran was killed Wednesday morning while attempting to intervene in an alleged domestic dispute involving an active-duty airman.
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