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U.S. Marines with 9th Engineer Support Battalion and Navy Seabees with Naval Mobile Construction Battalion 4 load a Joint Light Tactical Vehicle onto an improved ribbon bridge during exercise Pacific Pioneer, Naha Port, April 21, 2021. Pacific Pioneer serves as 9th ESB’s Marine Corps Combat Readiness Evaluation as well as an opportunity to demonstrate the ability to sustain expeditionary advanced bases with survivable force protection, practice naval integration, and position long range precision fires and tactical logistics nodes across littoral regions in support of naval operations. - U.S. Marines with 9th Engineer Support Battalion and Navy Seabees with Naval Mobile Construction Battalion 4 load a Joint Light Tactical Vehicle onto an improved ribbon bridge during exercise Pacific Pioneer, Naha Port, April 21, 2021. Pacific Pioneer serves as 9th ESB’s Marine Corps Combat Readiness Evaluation as well as an opportunity to demonstrate the ability to sustain expeditionary advanced bases with survivable force protection, practice naval integration, and position long range precision fires and tactical logistics nodes across littoral regions in support of naval operations.