Brigadier Gen. James W. Lukeman, the 2nd Marine Division commanding general, congratulates Lt. Col. John L. Medeiros Jr., the 2nd Assault Amphibian Battalion commanding officer, after a change of command ceremony aboard Marine Corps Base Camp Lejeune, N.C., June 14, 2013. Medeiros began his career as a platoon commander with 2nd AA Bn. - Brigadier Gen. James W. Lukeman, the 2nd Marine Division commanding general, congratulates Lt. Col. John L. Medeiros Jr., the 2nd Assault Amphibian Battalion commanding officer, after a change of command ceremony aboard Marine Corps Base Camp Lejeune, N.C., June 14, 2013. Medeiros began his career as a platoon commander with 2nd AA Bn.