 Complete the following phrase:  In 1946, the first Chinese ceremonial unit was formed in Yanan to welcome the visit of General George Marshall, the special envoy of US President Harry Truman. The 500-member honor guard was commissioned by Eighth Route Army Commander-in-Chief Zhu De and rehearsed the day before the visit at Yanan Airport. The unit would later serve under the newly formed PRC as Mao Zedongs protocol unit for the presentation of credentials. On 16 October, 16 days after the 