Col. Daren Margolin has been relieved as head of Security Battalion at Marine Corps Base Quantico, Va. (Marine Corps) The two-star head of Marine Corps Installations Command has relieved the commanding officer of Quantico’s Security Battalion following an incident involving a personal weapon, Marine Corps officials said. Col. Daren Margolin, a 24-year officer was removed from his post Oct. 18 by Maj. Gen. Juan Ayala due to a loss of confidence in his ability to command, said Capt. Maureen Krebs, a Marine Corps spokeswoman. Krebs said the decision stemmed from a single incident last week involving one of Margolin’s personal...