 Complete the following phrase:  During the Diệm era, the VNQDD were implicated in two failed coup attempts. In November 1960, a paratrooper revolt failed after the mutineers agreed to negotiate, allowing time for loyalists to relieve the president. Many of the officers involved had links to or were members of the VNQDD, and fled the country after the coup collapsed. In 1963, VNQDD leaders Tam and Vũ Hồng Khanh were among those arrested for their involvement in the plot; Tam committed suicide before the case started, and Khanh was jailed. In February 1962, two Republic of Vietnam Air Force pilots, Nguyễn Văn Cừson of a prominent VNQDD leaderand Phạm Phú Quốc, bombed the Independence Palace in a bid to kill Diệm and his family, but their targets escaped unharmed. Diệm was eventually 