 Complete the following phrase:  Before the 4th Marine Division was activated, Horner joined East Coast Echelon of the division at Camp Lejeune in May 1943. He served as chief of staff of the echelon, and, following the absorption of the East Coast Echelon into 4th Marine Division under Major General Harry Schmidt in August 1943, Horner was appointed division infantry operations officer. He sailed for the Pacific theater in January 1944 and subsequently participated in the 