PACIFIC OCEAN Marine aviation maintainers from the “Tomcats” of Marine Strike Fighter Squadron 311 tighten tie-down chains on an AV-8B Harrier in the hangar bay of Wasp-class amphibious assault ship USS Essex. Essex is currently underway conducting a PHIBRON/MEU Integration training exercise with Amphibious Squadron THREE and 15th Marine Expeditionary Unit in preparation for an upcoming deployment.