Keywords: Defense.gov News Photo 090520-N-0506A-910.jpg en U S Marines from the 13th Marine Expeditionary Unit provide security for a CH-46E Sea Knight helicopter during a joint mass casualty training exercise in Grand Bara Djibouti near Camp Lemonier on May 20 2009 Marines from the unit trained with Guardian Angels from the 82nd Expeditionary Rescue Squadron during the day-long exercise 090520-N-0506A-910 http //www defense gov/photos/newsphoto aspx newsphotoid 11330 2009-05-20 en Petty Officer 2nd Class Jesse B Awalt U S Navy PD-USGov-Military Import by User Slick-o-bot/Defense gov News Photos Camp Lemonnier Taken with Nikon D3 CH-46 Sea Knight 13th Marine Expeditionary Unit |