sentences:  He rose to become the deputy chief of staff in the Army of the Republic of Vietnam (ARVN), but his record of political loyalty was called into question.In 1960, during an attempted coup by rebel paratroopers, Khánh jumped over the walls of the Independence Palace and joined Diệm during the siege, trying to negotiate an end to the stand-off with the rebels.Khánh parleyed with the rebels long enough for loyal forces to arrive from the outside the capital to suppress the uprising, but his critics contended that he was waiting to see which side would gain the upper hand and was not committed to Diệm.