One of the militant Syrian rebel groups provided access to advanced U.S. missiles said that it is seeking “the return of all Syrian land occupied by Israel,” a stance that could potentially complicate U.S. military support to the armed rebel group. The leader of an official rebel group sanctioned by the Syrian Military Council and in possession of sophisticated U.S. arms expressed his opinion in an interview published over the weekend by the Syrian news organization Tahrir Souri. Ahmad Al-Sa’oud, who heads the rebel unit Division 13, was asked by the interviewer to explain “your stance, as an armed opposition...