Lieutenant Col. Dave Lucas, the 10th Marine Regiment, 2nd Marine Division executive officer, stands in front of an M198 Howitzer, Sept. 14, 2013, aboard Marine Corps Base Camp Lejeune. Lucas is retiring Nov. 1, and is having his retirement ceremony Sept. 20. - Lieutenant Col. Dave Lucas, the 10th Marine Regiment, 2nd Marine Division executive officer, stands in front of an M198 Howitzer, Sept. 14, 2013, aboard Marine Corps Base Camp Lejeune. Lucas is retiring Nov. 1, and is having his retirement ceremony Sept. 20.