SAN DIEGO — A Camp Pendleton-based Marine has been charged with cyberstalking several young women, accused of demanding sexually explicit photos and videos online and then repeatedly harassing and threatening them when they refused to comply, according to a complaint filed in Los Angeles federal court Wednesday. Johao Miguel Chavarri, 25, is accused of targeting at least 11 women who currently or previously lived in his hometown of Torrance. Investigators believe he met many of them — or their friends, family members or boyfriends — while he attended various high schools and El Camino College …