Weapons Training Battalion, Marine Corps Installations East – Marine Corps Base Camp Lejeune received a new commanding officer during a change of command at Stone Bay June 15. Lt. Col. Ivan I. Monclova relinquished command of WTB to Lt. Col. Carlos A. Vallejo in the bright, morning ceremony. - Weapons Training Battalion, Marine Corps Installations East – Marine Corps Base Camp Lejeune received a new commanding officer during a change of command at Stone Bay June 15. Lt. Col. Ivan I. Monclova relinquished command of WTB to Lt. Col. Carlos A. Vallejo in the bright, morning ceremony.