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BATON ROUGE, LA - JULY 17:  Baton Rouge Police officers patrol Airline Hwy after 3 police officers were killed early this morning on July 17, 2016 in Baton Rouge, Louisiana. According to reports, one suspect has been killed while others are still being sought by police.  (Photo by Sean Gardner/Getty Images)
BATON ROUGE, LA - JULY 17:  Baton Rouge Police officers patrol Airline Hwy after 3 police officers were killed early this morning on July 17, 2016 in Baton Rouge, Louisiana. According to reports, one suspect has been killed while others are still being sought by police.  (Photo by Sean Gardner/Getty Images)

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    Baton Rouge shooter was a former Marine

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Baton Rouge shooter was a former Marine

The suspect in the Baton Rouge police shooting, Gavin Long, served five years in the U.S. Marines. CNN's Drew Griffin has more.

Baton Rouge shooter was a former Marine

The suspect in the Baton Rouge police shooting, Gavin Long, served five years in the U.S. Marines. CNN's Drew Griffin has more.