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The younger broth­er of Coast Guard sailor Kieron Si­mon is still call­ing for an­swers and clar­i­ty on the de­tails of his dis­ap­pear­ance, as they ob­served what would have been his 37th birth­day yes­ter­day.

Si­mon was part of a joint drug in­ter­dic­tion ex­er­cise off the coast of Grena­da in Feb­ru­ary, when he re­port­ed­ly board­ed a nar­co sub­ma­rine which lat­er sank while he was still on board.

A sec­ond sailor who was al­so aboard the ves­sel was thrown in­to the wa­ter but was res­cued.