A CH-46E Sea Knight with Marine Medium Helicopter Squadron 265 (Reinforced), 31st Marine Expeditionary Unit, lifts cargo to deliver to the USS Essex (LHD 2) during a resupply at sea on March 13, 2012. The ships are being resupplied at sea during the 31st Marine Expeditionary Unitís Certification Exercise, which upon completion certifies the 31st Marine Expeditionary Unit to respond to contingency missions throughout the Asia-Pacific region.