A female Marine officer made history Monday by becoming the first woman to graduate from the U.S. Marines Corps’ demanding Infantry Officer Course. The lieutenant, who wants to keep her identity private, successfully completed the 13-week training in Quantico, Virginia, becoming the U.S.’s first-ever female infantry officer. “I am proud of this officer and those in her class who have earned the infantry officer MOS [military occupational specialty],” Commandant Gen.