 Complete the following phrase:  In 1916, when working for the Union Steamship Company, he volunteered for the Māori Reinforcements and became one of 500 Cook Islanders who joined the New Zealand Expeditionary Force. He was initially stationed with the New Zealand Rarotongan Company in El Qantara, Egypt, and in early 1917 was promoted to Sergeant. In late 1917 he participated in the 