Marines and Sailors of Combat Logistics Battalion 31 and Marine Medium Helicopter Squadron 265 (Reinforced), both with the 31st Marine Expeditionary Unit, explore the historical site of a 1942 12-inch coastal defense gun during a tour here Nov. 4, 2011. The gun was used by American and Filippino service members defending Corregidor in 1942. Service members of the 31st MEU toured Corregidor after the completion of the Amphibious Landing Exercise, designed to enhance interoperability between the military forces, continuing the allied relationship that has existed for more than half a century. - Marines and Sailors of Combat Logistics Battalion 31 and Marine Medium Helicopter Squadron 265 (Reinforced), both with the 31st Marine Expeditionary Unit, explore the historical site of a 1942 12-inch coastal defense gun during a tour here Nov. 4, 2011. The gun was used by American and Filippino service members defending Corregidor in 1942. Service members of the 31st MEU toured Corregidor after the completion of the Amphibious Landing Exercise, designed to enhance interoperability between the military forces, continuing the allied relationship that has existed for more than half a century.