Keywords: US Navy 101129-N-6552M-175 Sailors aboard the amphibious assault ship USS Boxer (LHD 4) participate in a joint service mask leak test.jpg en SAN DIEGO Nov 29 2010 Sailors aboard the amphibious assault ship USS Boxer LHD 4 participate in a joint service mask leak test The test simulates chemical contamination ensuring masks are sealed properly under various conditions U S Navy photo by Mass Communication Specialist 2nd Class Christopher Menzie/Released 2010-11-29 101129-N-6552M-175 Navy http //www navy mil/view_image asp id 94710 U S Navy photo by Mass Communication Specialist 2nd Class Christopher Menzie PD-USGov-Military-Navy Aboard USS Boxer LHD-4 MCU-2/P Protective Mask |